I. Policy background

　　In 2016, the city implemented the decentralization of urban renewal and strong areas. According to the Decision of Shenzhen Municipal People’s Government on Implementing the Reform of Urban Renewal (Order No.288 of Shenzhen Municipal People’s Government) (hereinafter referred to as Order No.288) and the Decision of Shenzhen Municipal People’s Government on Deepening the Reform of Planning Land System and Mechanism (Order No.298 of Shenzhen Municipal People’s Government) (hereinafter referred to as Order No.298), the examination and approval authority of urban renewal projects and the implementation plan of agricultural conversion involved are adjusted to district governments (including new ones) Under the new situation of decentralization in strong areas, in order to do a good job of linking up the work among provinces, cities and districts after the reform, better guide and standardize the examination and approval of land for urban renewal projects of demolition and reconstruction, and improve the efficiency of examination and approval, the Provisions on the Examination and Approval of Land for Urban Renewal Projects of Demolition and Reconstruction in Shenzhen (hereinafter referred to as the Provisions) is formulated in combination with the relevant provisions of the state, provinces and municipalities on land management, which serves as the basis for urban renewal agencies in various districts to examine and approve the implementation plan of land for urban renewal projects and the conversion of agricultural land.

　　Second, the main content

　　The "Regulations" consists of nineteen articles, the main contents of which are as follows:

　　(A) on the scope of application of the policy

　　The "Regulations" apply to the examination and approval of the implementation plan for the development and construction land and its agricultural land conversion.

　　(B) on the division of land use approval authority

　　According to Decree No.288 and its implementation opinions and Decree No.298, the municipal competent department of planning and land is the competent department of urban renewal business, responsible for the policy formulation and business guidance of the implementation plan for the development and construction of land and its agricultural land conversion, and summarizes the examination and approval of each district every six months and reports it to the municipal government; The district government is responsible for the examination and approval of the implementation plan for the development and construction of land and its agricultural land conversion; The urban renewal agencies in each district are responsible for the specific examination and approval work, and the relevant departments do a good job of cooperation within the scope of their duties.

　　(3) About the scope of land use approval

　　Urban renewal projects are based on the scope of project demolition defined by urban renewal unit planning, and land use approval is carried out according to the phased implementation timing determined by urban renewal unit planning. The "Regulations" distinguish four situations, which involve staging but not project implementation, not involving staging but sub-project implementation, sub-project implementation by stages, and sub-project implementation by stages, and clarify the units that approve the development and construction land. If a whole area contains a number of development and construction land, all development and construction land shall go through the formalities of land use examination and approval at the same time, and the subsequent procedures shall go through the formalities of signing the land use right transfer contract at the same time.

　　(four) on the land application materials and approval conditions.

　　In accordance with the Decision of the Ministry of Land and Resources on Amending the Administrative Measures for the Examination and Approval of Construction Land, the Notice of the Guangdong Provincial Department of Land and Resources on Implementing the Opinions of the State on Improving and Optimizing the Pre-examination and Review of Construction Projects, and the Notice of the Shenzhen Municipal Planning and Land Resources Committee of the Shenzhen Municipal Finance Committee on Further Defining the Payment Process of Paid Use Fees for New Construction Land, The Reply on Approving to Authorize the Shenzhen Municipal People’s Government to Exercise Relevant Land Management Authority, the Measures for Urban Renewal in Shenzhen and its detailed rules for implementation, and in combination with the provisions of relevant policies such as prevention and management of geological disasters, investigation and evaluation of soil environment, the Provisions clarify the application materials and conditions for examination and approval of development and construction land and its implementation plan for agricultural conversion.

　　(five) on the development and construction of land involved in the approved land without construction.

　　Linked to the Detailed Rules for the Implementation of the Measures for Urban Renewal in Shenzhen and the Technical Regulations for the Planning and Compilation of Urban Renewal Units for Demolition and Reconstruction in Shenzhen (hereinafter referred to as the Technical Regulations for the Planning and Compilation of Renewal Units), the Regulations stipulate the work of this situation in the stages of urban renewal unit planning approval, project implementation subject confirmation, cancellation of real property right certificate, land use approval and land transfer from the perspective of land use approval. Following the principle of equal area, equal period, equal development intensity and other functions, the area, use, plot ratio, transfer period and start date of the vacated land shall be implemented according to the agreement in the transfer contract of the land use right of the vacated land.

　　(six) the situation that the urban renewal unit contains overhead corridors, cross-street buildings or underground spaces.

　　The "Regulations" are linked with the "Technical Regulations on Updating Unit Planning", and the applicants, departments and procedures for land approval for public overhead corridors and public passages outside the scope of development and construction land are defined. At the same time, the "Regulations" clarify that the horizontal projection range, area and vertical elevation of overhead corridors, cross-street buildings or underground spaces should be clear when the construction land is approved. However, considering that it is difficult to define the specific spatial location in the stage of land use approval, the Regulations propose that in the stage of construction project planning permission, the horizontal projection range, area and vertical elevation can be appropriately adjusted according to the urban renewal unit planning and relevant standards and specifications, and a supplementary agreement on the land use right transfer contract can be signed, so it is not necessary to re-apply for construction land approval.

　　(seven) on the phased implementation of urban renewal units, there is a lack of legal land use indicators within the scope of later project demolition.

　　Urban renewal unit planning takes urban renewal unit as a unit for overall planning, and there may be insufficient legal land use indicators within the scope of later project demolition in urban renewal units implemented by stages. In this case, if the legal land use index of the later project is insufficient, the legal land use index of the signed land use right transfer contract can be used to exceed the area of the transferred development and construction land. When there are many kinds of land use categories beyond the legal land use index, they shall be used in the order of land price calculation.

　　(eight) on the urban renewal project involving non-agricultural construction land and illegal construction land left over from the history of rural urbanization.

　　In accordance with the principle of respecting history and safeguarding the rights and interests of the original rural collective, and according to the order of demarcation of non-agricultural construction land, the Regulations respectively stipulate different treatment principles for non-agricultural construction land before and after the disposal of illegal construction land left over from rural urbanization history.

　　(nine) on the situation that the urban renewal project involves the overlapping of non-agricultural construction land and old house village land.

　　For non-agricultural construction land and the old house village land overlap, the overlapping part is treated as non-agricultural construction land, and the old house village land is not included in the legal land use index; The overlapping part is treated as the land used in the old house village, and the non-agricultural construction land can be separately included in the legal land use index within the scope of demolition, and there is no need to adjust the non-agricultural construction land plan.

　　(ten) on the time limit and procedures for land use approval.

　　Combined with the relevant provisions of the administrative license, the time limit for examination and approval of development and construction land is 20 working days. The approval procedure is as follows:

　　Figure 1 Flow chart for approval of development and construction land

　　(twelve) land transfer and non-agricultural construction land index verification.

　　Urban renewal unit planning determines that the land to be handed over to the government free of charge should be handed over before the signing of the land use right transfer contract for urban renewal projects. Urban renewal projects involving non-agricultural construction land within the scope of demolition, the district urban renewal agencies shall notify the municipal competent department of planning and land to send agencies within the jurisdiction to write off non-agricultural construction land indicators before the signing of the land use right transfer contract for urban renewal projects.

　　(thirteen) the time limit and procedures for the approval of the implementation plan for the conversion of agricultural land.

　　If the development and construction land of the project involves the occupation of agricultural land and unused land, the implementation plan for the conversion of agricultural land shall be formulated by the district urban renewal agency and submitted to the district government for approval simultaneously with the development and construction land. The procedure is as follows:

　　Fig. 2 Flow chart for approval of implementation scheme of agricultural conversion

　　(fourteen) on the use of land use planning indicators.

　　Before compiling the implementation plan of agricultural land conversion for renewal projects, the district urban renewal institution shall solicit the opinions of the agencies dispatched by the competent department of city planning and land administration, and clarify the sources of new construction land indicators. The dispatched offices of the municipal competent department of planning and land shall, according to the reply issued by the district government, do a good job in the ledger management of the indicators of agricultural conversion in the jurisdiction, and report to the municipal competent department of planning and land regularly for summary as required.

　　(15) Information disclosure

　　After the district government issues the approval of construction land and the approval of the implementation plan of agricultural conversion, the district urban renewal institution shall make the approval of land use and the implementation plan of agricultural conversion public at the project site and portal website respectively.

　　(XVI) About the effective date.

　　The Regulations shall come into force as of the date of promulgation.

　　According to the WeChat WeChat official account of Shenzhen Health and Health Commission, there were 27 new positive cases in Shenzhen from 0: 00 to 24: 00 on September 29th, 15 cases were diagnosed as confirmed cases in COVID-19, and 12 cases were diagnosed as asymptomatic infected people in Covid-19.

　　Among them, 18 cases were found in centralized isolated observers, 4 cases were found in home isolated medical observers, 4 cases were found in non-closed-loop management key personnel screening, and 1 case was found in community screening.

　　The new cases are as follows:

　　Case 1

　　Female, 38 years old, living in Reservoir New Village, Cuizhu Street, Luohu District, was found among centralized isolated observers.

　　Case 2

　　Male, 36 years old, living in Reservoir New Village, Cuizhu Street, Luohu District, was found among centralized isolated observers.

　　Case 3

　　Female, 49 years old, living in Reservoir New Village, Cuizhu Street, Luohu District, was found among centralized isolated observers.

　　Case 4

　　Female, 63 years old, living in Reservoir New Village, Cuizhu Street, Luohu District, was found in the screening of key personnel in non-closed-loop management.

　　Case 5

　　Female, 29 years old, lives in the dormitory building at No.2019, Buxin Road, Cuizhu Street, Luohu District, and was found among home isolation medical observers.

　　Case 6

　　Male, 3 years old, living in the dormitory building at No.2019 Buxin Road, Cuizhu Street, Luohu District, was found among home isolation medical observers.

　　Case 7

　　Male, 41 years old, living in the courtyard of No.29 Dongmen North Road, Cuizhu Street, Luohu District, was found in the screening of key personnel in non-closed-loop management.

　　Case 8

　　Female, 43 years old, living in Sunshine World, Cuizhu Street, Luohu District, was found in community screening.

　　Case 9

　　Male, 49 years old, living in Dong ‘an Garden, donghu street, Luohu District, was found among centralized isolated observers.

　　Case 10

　　Female, 48 years old, living in Dong ‘an Garden, donghu street, Luohu District, was found among centralized isolated observers.

　　Case 11

　　Female, 50 years old, living in Dongle Garden, donghu street, Luohu District, was found among centralized isolated observers.

　　Case 12

　　Male, 35 years old, living in the second district of Buxin Garden, donghu street, Luohu District, was found among centralized isolated observers.

　　Case 13

　　Female, 43 years old, living in Jingxuan Garden, Huangbei Street, Luohu District, was found in the screening of key personnel in non-closed-loop management.

　　Case 14

　　Male, 63 years old, living in Yuling Garden, Nanwan Street, Longgang District, was found among concentrated isolated observers.

　　Case 15

　　Male, 52 years old, living in Yuling Garden, Nanwan Street, Longgang District, was found among concentrated isolated observers.

　　Case 16

　　Female, 46 years old, living in Yuling Garden, Nanwan Street, Longgang District, was found among home isolation medical observers.

　　Case 17

　　Male, 44 years old, living at No.21 Nanyuan Road, Nanwan Street, Longgang District, was found in the screening of key personnel in non-closed-loop management.

　　Case 18

　　Female, 48 years old, living in Rui Long Xuan, Longxiang Garden, Jihua Street, Longgang District, was found among centralized isolated observers.

　　Case 19

　　Male, 28 years old, living in Rui Long Xuan, Longxiang Garden, Jihua Street, Longgang District, was found among home isolation medical observers.

　　Case 20

　　Male, 44 years old, living in Lane 7, Laowei, Village 1, Buji Street, Longgang District, was found among centralized isolated observers.

　　Case 21

　　Male, 29 years old, living in Minzhi Street and Mansion in Longhua District, was found among centralized isolated observers.

　　Case 22

　　Male, 39 years old, living in Minzhi Street, Longhua District, Minle District 1, was found among centralized isolated observers.

　　Case 23

　　Male, 31 years old, living in the old village of clear lake, Longhua Street, Longhua District, was found among the centralized isolated observers.

　　Case 24

　　Male, 34 years old, living in the first phase of Xintian, Vientiane, xixiang street, Bao ‘an District, was found among centralized isolated observers.

　　Case 25

　　Male, 46 years old, living in Xiangbin Square, Xin ‘an Street, Bao ‘an District, was found among centralized isolated observers.

　　Case 26

　　Male, 38 years old, living in Xinzhou North Village, Shatou Street, Futian District, was found among centralized isolated observers.

　　Case 27

　　Male, 48 years old, living in Shanhaiyuan, Dapeng Street, Dapeng New District, was found among centralized isolated observers.

　　The above cases have been transferred to the emergency hospital of the Third People’s Hospital of the city for isolation treatment, and the situation is stable.

　　The trajectory of new cases involves Luohu and Longgang.

　　After preliminary investigation, the main activity tracks of new cases in recent days are as follows:

　　luohu district

　　Cuizhu Street:Riyue Yonghe Restaurant (Dong Xiao Store), Dong Xiao Meat Market, Lottery Station (Dong Xiao Comprehensive Building), Dong Xiao Vegetable Market Weimin Barber Shop.

　　Guiyuan neighborhood: West Lake Spring (Baihui Store), Bingfen Vientiane Skating rink, Xingmeile (Vientiane City Store)

　　Huangbei Street:Huazai Barber Shop, Table Tennis Club of Xinxiu South Industrial Zone

　　Donghu street:Starbucks (Xihuicheng Branch)

　　Dongxiao Street:Cao pu Nong pi market

　　Longgang District

　　Henggang Street:Riyue Yonghe Restaurant (Henggang Branch)

　　Nanwan Street:Zhongfujia Fresh Supermarket, Yuling Market and Yuesheng Roast Meat Shop.

　　At present, the disposal work such as flow tracing, isolation control, nucleic acid detection and medical treatment is being carried out in an orderly manner. Members of the public are requested to continue to fulfill their personal responsibility for prevention and control, take protective measures such as wearing masks, washing hands frequently, ventilation frequently, disinfection frequently, keeping social distance, and vaccination, and actively cooperate with the implementation of various epidemic prevention and control measures.

Original shichao bad review

Yesterday, Bing ushered in a super heavy update.

Apart from other details of the update, a comprehensive open beta is enough.

This means that you only need to register a Microsoft account to use Bing Chat.

In this way, I’m afraid Bing is the biggest language model with the lowest usage threshold at present.

In addition to the open beta, other updates are also very exciting. Before you rush to experience it, you can find out what new tricks Microsoft has made this time.

The world super here, for everyone to sum up as follows:

1. Multi-modal content and text mapping.

2. Historical record function.

3. Open plug-in access.

4, and a bunch of ultra-practical small functions.

It should be noted that at present, not all functions are open, so I will introduce them to you one by one.

First of all, it is the first update: graphic and multimodal content.

Although Microsoft launched Wencheng Map before, it has updated more than 100 languages this time, and now you can directly ask Bing to help you generate pictures in Chinese.

If you want to experience the latest pictures, you need to adjust the dialogue style to be "more creative". After that, just click and ask.

However, after the experience of Shichao, I feel that Bing’s Wen Chengtu is still almost interesting.

Because Bing is connected to DALL·E, the generated pictures may be good before. However, compared with midjourney and Stable Diffusion, which are now popular, it’s not enough. .

Moreover, although Chinese input is supported, the understanding of Chinese in Bing drawing is almost unknown.

When Shi Chao asked a classic "braised lion head", Bing really brought me a plate of lion head. .

If we look closely, we will find that it translates "lion’s head" into "lion’s head"

Sweet and Sour Mandarin Fish painted real squirrels and real fish. .

But Shichao soon discovered that it was not that Bing couldn’t draw. .

If we ask it to translate the input into English, it will understand that the lion’s head is not a lion, but a pork ball.

After the translation is in place, there is nothing wrong with the generated picture.

From this point of view, Bing’s own Chinese understanding should be no problem.

However, Wenchengtu is based on Bing image creator, a Microsoft painting platform, which may have translated Chinese literally when drawing.

After trying Wenchengtu, we are only halfway through the first big update. Visually, Bing has another highlight this time, which is its multimodal content.

When we ask a question, the related pictures will be displayed below the text results. In this way, the results can be displayed very intuitively, saving the time of going in and watching one by one.

Also asked "Braised Lion Head", Bing’s answer was completely correct, and even introduced the practice of this dish.

Shichao thought it would be convenient to use this image output function to find expression packs.

In addition to pictures, Bing’s multimodal mode also supports video output. Moreover, when we move the mouse to the video cover, we can also preview and play it online.

After that, not only the output content supports multimodal, but also the input can be uploaded with pictures.

What can be experienced at present is almost the first big update. Because of the following contents, most of them are not open to the public yet.

Although I can’t get started yet, from the demonstration video, it seems that they are the real highlights.

For example, the second updated history function can take the conversation experience to the next level.

Every time we ask questions, we will be saved in the guide on the right. Click on the question to jump to the corresponding location.

Moreover, after clicking on the answer link, Bing Chat will shrink to the side and become a page sidebar.

This small change is quite convenient. For example, if we import a PDF, we can use Bing to help you summarize, find words and translate.

In addition, Bing will also support long conversations. Even if we quit and close the chat interface halfway, the conversation will remain. Next time you click in, you can continue from the last place.

Chat content will also support exporting and sharing, and can be shared with friends on social media with one click, or imported into applications such as Word.

If the second update is to make it more convenient for users.

The third major update, which is also the most likely function of Shichao-plug-in, is to make Bing super-evolve.

The official example says that he is about to access the takeaway platform OpenTable. This means that in a word, you can ask Bing to recommend a restaurant for you, or make a direct restaurant reservation.

If you can access other platforms in the future, you may be able to stimulate stronger functions. For example, by accessing a map, you can make a route according to your own needs.

In addition, Microsoft will build a development platform to let more people participate in the development of plug-ins.

If this road goes on, it will be more than just the work done by search engines in the past.

In addition to the above three major updates, Microsoft also showed a lot of practical small functions, such as asking Bing to find a movie for you, and after finding it, you can jump and play it directly.

The mobile version will support page context questions, for example, if you are browsing an article or a website, you can ask Bing questions about what you are browsing, and it can also answer them.

Or write a manuscript directly on the Bing page and tell it the tone, length and wording you want.

I got so cruel that I even lost my job in Microsoft 365. .

Generally speaking, this update of Bing shows the ambition of this search engine.

That is: what search engines can do, I want to do my best, and what search engines can’t do before, I want to steal it now.

Moreover, in the official blog, Microsoft said that Bing’s daily activities have exceeded 100 million, and the daily installation of APP has increased fourfold.

In addition, the share of Edge continues to grow for 8 consecutive years, and various functions are updated and added, and third-party plug-ins supplement Bing.

Establishing a new Microsoft ecosystem may, indeed, be just around the corner.

Although many functions are not online yet, the next update is not far away. Because according to the feedback uploaded by users, Microsoft will make updates and changes every week.

Although very unkind, I really miss @ Google at this moment.

Brother, others have gone to the next Level. What about yours?

Written by: Four Editors: Jiang Jiang & Noodle Cover: Xuan Xuan

Pictures and data sources:

Twitter

Announcing the next wave of AI innovation with Microsoft Bing and Edge

Original title: "NewBing suddenly opened up in an all-round way, and also updated the functions of a bunch of dead friends. 》

Read the original text

　　[Technology] Cars have become an indispensable part of our lives. The combination of steering wheel+shift lever+pedal seems to have become a natural way to control cars, but their respective mechanisms are rarely understood. Take the steering wheel in our hands as an example, the majority of riders are still vague about the common concepts of various steering systems, such as "the difference with hydraulic power" and "what is the variable power", and so on. Below, we will systematically introduce various common steering systems, answer these questions, and discuss the mysteries and mysteries of various steering systems with you.

　

　　Because of the long space, this paper introduces our most common system now, interprets "where does the power come from" and introduces the classification of power steering system.

　　Power steering, as its name implies, is to resist steering resistance by increasing external force, so that drivers can complete steering with less force. It is also called power steering. It was originally designed to make some large vehicles with heavy weight operate more easily, but now it has become very popular. It makes driving easier and easier, and makes vehicles more agile and improves safety to some extent. Power steering can be divided into two categories according to the different sources of power-hydraulic power and electric power.

●

　　The origin of hydraulic power steering can be traced back to February, 1902. Frederick W. Lanchester of Britain invented "Cause the steering mechanism to be actuated by hydraulic power", that is, the hydraulic driving steering mechanism. After that, inventors in the United States and Canada successively registered patents for similar inventions. In automobile production, the commercial production of hydraulic power steering system was first realized, and it was named Hydraguide hydraulic steering system, and it was installed on Chrysler’s sixth generation Imperial in 1951. With the development of technology, the steering system with electronic pump instead of mechanical pump appears, so the current hydraulic power is mainly divided into mechanical hydraulic power and electronic hydraulic power. In addition, the electronic servo hydraulic power steering system is derived from the mechanical hydraulic power.

　

　　Let’s look at the main principle of mechanical hydraulic power steering, which is based on mechanical rack-and-pinion steering mechanism, and adds a whole set of hydraulic system, including liquid storage tank, hydraulic booster pump, mechanical valve connected with steering column, hydraulic cylinder on steering mechanism and the one that can push steering rod, etc.

　　The hydraulic pump provided by mechanical power steering is driven by a belt, which means that the steering pump can only run when the engine is running, which is why the steering wheel power disappears after the engine is turned off. On the steering machine, there is a mechanical valve that can rotate with the steering column. When the steering wheel does not rotate left and right, the pressure in the chambers on both sides of the piston is consistent and in a balanced state. When the steering wheel rotates, the mechanical valve connected to the steering column will be opened or closed accordingly, and the oil on one side will return directly to the oil storage tank without passing through the hydraulic cylinder, and the oil on the other side will continue to be injected into the hydraulic cylinder, so that the pressure difference between the two sides of the piston will be pushed under the action of hydraulic force, and then the auxiliary force will be generated to push the steering rod to steer the wheels, which greatly reduces the force required for us to turn the steering wheel.

　　Another advantage of hydraulic power steering system is to improve comfort and safety. When the wheels jump violently and the tires turn involuntarily when encountering potholes, the vibration can be well buffered and absorbed by the action of hydraulic pressure on the piston, which greatly reduces the vibration transmitted to the steering wheel. At the same time, this structure also improves the safety. For example, when a vehicle using the traditional rack-and-pinion mechanism turns, the tire suddenly changes direction when it encounters a pothole, and the rack will drive the gear to reverse the steering wheel, resulting in the situation of "beater", which is easy to hurt the driver’s hand, so there will be no such problem in a hydraulically assisted vehicle.

　　Mechanical hydraulic booster features:The whole system is a mechanical structure, from the mechanical hydraulic pump driven by the belt to the hydraulic mechanical valve body on the steering column, without any electronic system, with mature and stable technology, high reliability and wide application range. Even if the hydraulic system of the vehicle fails and loses power, it can still rely on the traditional rack and pinion mechanism for steering. Disadvantages are complex structure, large space occupation and high manufacturing cost, which also makes the maintenance difficult and costly. And because the hydraulic pump is driven by the engine belt, it will consume part of the power of the engine, which will affect the fuel economy and the power of the vehicle, especially for small-displacement vehicles with relatively weak power. In addition, the strength of the mechanical hydraulic power-assisted system is not adjustable, so it is difficult to take into account the different requirements for pointing accuracy when driving at low speed and high speed.

● Electro-hydraulic booster

　　The so-called Electro-hydraulic power steering (EHPS for short) has exactly the same principle as mechanical hydraulic power steering, but the biggest difference from mechanical hydraulic power steering is that instead of using a hydraulic pump driven by an engine through a belt, it is replaced by an electric pump.

　　The advantages of electro-hydraulic power assist are firstly reflected in energy consumption. First, the electronic pump driven by electric energy uses the electric energy output by the generator and the battery, and no longer consumes the power of the engine itself. The start and stop of the electronic pump are all controlled by the electronic system. When it is not steering, the electronic pump is turned off, unlike the mechanical hydraulic power assist pump, which is always linked with the engine, further reducing energy consumption.

　　Secondly, the electronic control unit of the electro-hydraulic power steering system can change the power of steering assistance by processing the information of sensors such as speed sensor, lateral acceleration sensor and steering angle sensor, and changing the flow rate of the electronic pump in real time, that is, the function of variable power assistance with speed. Of course, it is not only the electro-hydraulic power assist that can realize the variable power assist with speed. We will introduce various "variable" power assist steering systems in detail in later articles.

　　Electro-hydraulic power assist has been gradually popularized since the late 1990s, and brands such as,,,,, and have models using electro-hydraulic power assist system. We are familiar with, and other models use such a system.

"Triumph, old models and other models use electro-hydraulic power."

　　Why can’t electro-hydraulic assist replace mechanical hydraulic assist?

　　No matter from the aspects of technology, function or economy, electro-hydraulic power assistance has more advantages than mechanical hydraulic power assistance. However, at present, electro-hydraulic power assistance has not been able to replace mechanical hydraulic power assistance for the following reasons:

　　1. The cost of electro-hydraulic booster is higher. Compared with the mechanical hydraulic power-assisted system, after adding the electronic control system and replacing it with the electronic pump, the manufacturing cost of electronic hydraulic power-assisted system is higher, the technology is more complicated, and the difficulty and cost of maintenance are also increased.

　　2. The reliability is not as good as that of mechanical hydraulic booster. In addition to the failure of steering mechanism and hydraulic mechanism, electro-hydraulic power assist also increases the possibility of electrical system failure, so its reliability is not as good as that of traditional hydraulic power assist system.

　　3. The assistance is limited. Although the use of electronic pump has obvious advantages, it needs to be driven by the electric energy of the generator, and the vehicle-mounted generator itself and the maximum current it can provide are limited, so the power of the electronic pump is also limited, and the load it can carry is also limited. Therefore, at present, most of the models that use electro-hydraulic power are medium-sized vehicles. For vehicles that need greater assistance, the electro-hydraulic assistance system is beyond the reach.

　　4. Evolved mechanical hydraulic booster system. With the development of technology, the variable speed function of electro-hydraulic power-assisted system has been realized on the evolved mechanical hydraulic power-assisted system (using solenoid valve body technology), and even a variable speed ratio system has been derived from the mechanical hydraulic power-assisted steering system, so the mechanical hydraulic power-assisted system with higher reliability and load-bearing capacity is still welcomed by manufacturers.

　　Recently, according to the China Youth Daily, "Ginger Soaks Foot" and "Drinking Tea for Beauty" … … With the increasing pressure of life, not only the post-90s generation who entered the workplace, but also many college students have begun to try various methods of health preservation. Health preservation is no longer the exclusive word of the elderly or middle-aged people, and the young campus groups represented by college students are constantly adjusting their lifestyles and advocating a healthier life and rest. Why are this wave of college students "trapped in health care" and "selling the old"? Many college students said that this is a way of "self-mockery" to fight anxiety and pressure.

　　In many people’s cognition, college students are relaxed and chic, and can have fun relatively freely. But in fact, many college students are very bitter and tired now. It is not unusual to do homework, research and activities in class until early morning or even later.

　　Under such a realistic background, it is not difficult to understand that many college students are "trapped in health preservation". Recently, a "2018 Life Consumption Trend Report" shows that based on the search volume of "Lycium barbarum" on the e-commerce platform of all ages, the proportion of search volume after 1995 increased significantly in September 2017. Honey, Lycium barbarum, whey protein, health tea and enzymes are the health foods that are keen on after 1995.

　　When I was in college, I was also a "busy maniac". I was really working hard. My meals and sleep were irregular, and I also had a tendency to overeat. At that time, I thought I was still young, so I indulged myself too much and was indifferent to some early warning signals of my body. But now, nearly a year after graduation, all kinds of physical and mental discomforts have emerged, and I realize that "karma" has come and I want to "pay my debts". Therefore, now I will also force myself to keep fit, such as drinking more hot water, going to massage, eating more healthy food and running to and from work.

　　The meaning of life is not temporary, but long-term. To quote a very fashionable online buzzword recently, "People who work too hard can’t run far". Who doesn’t want to "run away" on the road of life? So, please do it and cherish it.

　　Of course, it is not enough to rely solely on the self-awakening of young people, but also to exert efforts at the social level. To put it bluntly, in addition to focusing on the "burden reduction" of primary and secondary school students, the social level should also focus on the "burden reduction" of young people represented by college students. There is no denying that the latter should be under pressure and responsible, and strive hard to realize their own value and social value, but all this should not be at the expense of health. It should be a social consensus that only a good body and a healthy lifestyle can create more shocking values.

　　Mocheng

Recently, the China Breast Cancer Screening Standard (T/CPMA 014-2020) proposed by China National Cancer Center was published online in chinese journal of cancer prevention and treatment. The correspondent is Professor He Jie, director of National Cancer Center and academician of China Academy of Sciences.

As a common cancer, according to the latest global cancer burden data released by the International Agency for Research on Cancer (IARC) of the World Health Organization in 2020, there were 2.26 million new breast cancer cases in the world in 2020, surpassing lung cancer (2.21 million cases) for the first time, becoming the largest cancer in the world, accounting for 11.7% of new cancer cases. Among the newly diagnosed cancer patients, one in every eight is a breast cancer patient. China is a big country with breast cancer. In 2020, there will be about 420,000 new cases of breast cancer and nearly 120,000 deaths.

Screening, improving the detection rate of early breast cancer and precancerous lesions, and timely and effective treatment are important measures to improve the prognosis of breast cancer and reduce the risk of death. The standards put forward suggestions on the population, measures, results and management of breast cancer screening in China. We have sorted out the relevant contents, hoping to help you better understand the knowledge of breast cancer screening.

Image source: 123RF

Who should have breast cancer screening?

The standard suggests that people at high risk of breast cancer should be screened from the age of 40; The general risk population (all school-age women except the high-risk population) should be screened for breast cancer between 45 and 70 years old.

High-risk population

Women who meet any of the following conditions 1, 2 and 3 are at high risk of breast cancer.

1. Women with genetic family history, that is, women with any of the following: 1) First-degree relatives (mothers, daughters and sisters) have a history of breast cancer or ovarian cancer; 2) Among the second-degree relatives (aunts, grandmothers and grandmothers), two or more people suffered from breast cancer before the age of 50; 3) Among the second-degree relatives, 2 or more have ovarian cancer before the age of 50; 4) At least one first-degree relative carries a known pathogenic genetic mutation of BRCA1/2 gene, or carries a pathogenic genetic mutation of BRCA1/2 gene himself.

2. Have any of the following: 1) Age of menarche ≤12 years old; 2) menopausal age ≥55 years old; 3) Have a history of breast biopsy or surgery for benign breast diseases, or a history of atypical hyperplasia of breast (lobules or ducts) confirmed by pathology; 4) Use hormone replacement therapy of "estrogen and progesterone combination" for not less than half a year; 5) X-ray examination of breast after 45 years old suggests that the type of breast parenchyma (or breast density) is uneven compactness or compactness.

Note: Breast parenchyma types can be divided into fat type, scattered fibrous gland type, heterogeneous dense type (which may cover small masses) and dense type (which reduces the sensitivity of breast cancer detection).

3. Those who have any of the following two items: 1) No breast-feeding history or breast-feeding time less than 4 months; 2) No history of live birth (including never giving birth, abortion or stillbirth) or the age of first live birth ≥30 years old; 3) hormone replacement therapy using only "estrogen" for not less than half a year; 4) Abortion (including natural abortion and induced abortion) shall not be less than 2 times.

Image source: 123RF

How to screen?

General risk population: breast ultrasound examination should be performed every 1-2 years; If you do not have the conditions for breast ultrasound examination, you should use mammography.

High-risk population: breast ultrasound combined with mammography is performed once a year.

How to understand the screening results?

Classification of diagnostic results of mammography

The diagnostic results of mammography are usually classified by the Breast Imaging Reporting and Data System (BI-RADS), which is formulated by American Radiological Society (ACR) and widely used internationally.

1. BI-RADS 0: The existing image failed to complete the evaluation, and other image examinations need to be added.

2. BI-RADS 1: normal, no abnormality was found in mammography. The possibility of malignancy is 0%.

3. BI-RADS 2: Benign findings, with definite benign changes and no malignant signs. The possibility of malignancy is 0%.

4. BI-RADS 3: Benign lesions that may be large. 0% < malignant possibility ≤2%.

5. BI-RADS 4: Suspected malignant lesions, but without typical malignant signs. 2% < malignant possibility < 95%.

6. BI-RADS 4A: low-grade suspected malignancy. 2% < malignant possibility ≤10%.

7. BI-RADS 4B: moderately suspected malignant. 10% < malignant possibility ≤50%.

8. BI-RADS 4C: highly suspected malignant. 50% < malignant possibility < 95%.

9. BI-RADS 5: Highly suggestive of malignant lesions with typical imaging features of breast cancer. Malignant possibility ≥95%.

Image source: 123RF

Classification of ultrasonic diagnosis results of breast

The classification of ultrasound evaluation refers to the screening of National Comprehensive Cancer Network (NCCN) and the BI-RADS classification standard proposed by American Radiological Society.

1. BI-RADS 0: The diagnostic information obtained by ultrasound is incomplete and cannot be evaluated, and it needs to be evaluated after other imaging examinations.

2. BI-RADS 1: negative, no abnormality was found by ultrasound. The possibility of malignancy is 0%.

3. BI-RADS 2: Benign lesions, with definite benign changes and no malignant signs. The possibility of malignancy is 0%.

4. BI-RADS 3: Benign lesions that may be large. 0% < malignant possibility ≤2%.

5. BI-RADS 4: Suspected malignant lesions, but without typical malignant signs. 2% < malignant possibility < 95%.

6. BI-RADS 4A: low-grade suspected malignancy. 2% < malignant possibility ≤10%.

7. BI-RADS 4B: moderately suspected malignant. 10% < malignant possibility ≤50%.

8. BI-RADS 4C: highly suspected malignant. 50% < malignant possibility < 95%.

9. BI-RADS 5: Highly suggestive of malignant lesions with typical imaging features of breast cancer. Malignant possibility ≥95%.

Image source: 123RF

Screening result management

1. BI-RADS 1 and BI-RADS 2 need no special treatment.

2.　BI-RADS 3：

The evaluation of mammography is BI-RADS 3, so it is advisable to reexamine the breast on the lesion side at the next 6 months, and reexamine the breast on both sides at the 12th and 24th months.

If the lesion remains stable, it can continue to be reexamined, and if it has not changed for 2-3 years, it can be reduced to BI-RADS 2. If the lesion disappears or shrinks during the reexamination, it can be directly evaluated as BI-RADS 2 or BI-RADS 1. Biopsy should be considered if suspicious findings are found in the lesions during the reexamination.

The breast ultrasound evaluation is BI-RADS 3, so it is advisable to have breast ultrasound reexamination in 3-6 months, and it can be reduced to BI-RADS 2 if there is no change after 2 years of follow-up.

3. BI-RADS 4A: Further imaging examination and biopsy are needed.

4. BI-RADS 4B: Further imaging examination is needed, and biopsy is appropriate.

5. BI-RADS 4C and BI-RADS 5: Biopsy should be performed.

Image source: 123RF

tag

According to the standard, the breast physiological characteristics and breast cancer epidemic characteristics of women in China are quite different from those in western countries, so we can’t copy foreign experience. Establishing breast cancer screening standards suitable for women in China will play an important role in improving the scientificity, feasibility and practicability of breast cancer screening and reducing the incidence and mortality of breast cancer.

reference data

[1] He Jie, et al.,(2021). China female breast cancer screening standard (T/CPMA 014-2020). chinese journal of cancer prevention and treatment, DOI: 10.16073/J.CNKI.CJCPT.2021.01.02.

[2] Latest global cancer data: Cancer burden rises to 19.3 million new cases and 10.0 million cancer deaths in 2020. Retrieved Nov 16 ,2020, from https://www.iarc.fr/fr/news-events/latest-global-cancer-data-cancer-burden-rises-to-19-3-million-new-cases-and-10-0-million-cancer-deaths-in-2020/

Note: The purpose of this article is to introduce the progress of medical health research, not to recommend treatment schemes. For guidance on treatment plan, please go to a regular hospital.

　　Authors: Yang Haojie (Ph.D., Institute of Curriculum Textbooks, Ministry of Education) and He Chenggang (Researcher, Institute of Curriculum Textbooks, Ministry of Education)

　　Recently, Publicity Department of the Communist Party of China, together with the Ministry of Education, has published an Introduction to Socialism with Chinese characteristics Thought of the Supreme Leader in the New Era (hereinafter referred to as "Introduction"), which is a key measure to further promote the introduction of Socialism with Chinese characteristics Thought of the Supreme Leader in the New Era into teaching materials, into the classroom and into the mind, to better implement the fundamental task of educating people, and to meet the people’s needs for high-quality teaching materials. The publication of Introduction is an important event in the political life of the party and the country, an important event in the teaching work of teachers and a happy event in the study of hundreds of millions of young students. It is necessary to fully understand the great significance of the textbook Introduction in cultivating people with the innovative theory of the party, guiding young students to establish a correct world outlook, outlook on life and values, and striving to become a new person of the times who is responsible for national rejuvenation, highlighting the word "research" and further using the textbook well.

　　Adhere to the "three bases" and study the teaching materials in depth.

　　Introduction consists of three parts: introduction, 17 chapters and conclusion, which comprehensively reflects the latest achievements of the modernization of Marxism in China, great practice and great changes in the new era, and is a consensus research achievement in academic circles, with authority. The vast number of front-line teachers at all levels and schools in China should study textbooks, not only by reading one step first, but also by studying one level in depth, and even more by understanding one level in detail, so as to get into their minds and hearts.

　　First of all, based on the history of the party’s unity and leading the people for more than a hundred years, we should study the teaching materials comprehensively.Grasp the theme, main line and main content of the textbook "Introduction" as a whole, grasp the theoretical panorama of the latest achievements in the modernization of Marxism in China, and make sure that you really learn, believe and use it.

　　Secondly, based on the great practice and great changes in the new era in the past ten years, we should study the teaching materials in depth.Summarize and clarify the basic context of the textbook "Introduction", strengthen the thinking of historical logic in great practice, realistic logic in great change and theoretical logic in great achievements, so that history, reality and theory can "complement each other" in the textbook.

　　Thirdly, based on the overall situation of the great rejuvenation strategy of the Chinese nation and the unprecedented changes in the world for a hundred years, systematically study the teaching materials.Under the guidance of the Supreme Leader’s Socialism with Chinese characteristics Thought in the new era, we will study and analyze the complex international situation and great risks and challenges we are facing with a developmental vision and a comparative attitude, deepen our understanding of the great struggle, great project, great cause and great dream of the Party leading the people in the new era, constantly enhance our road, theory, system and cultural identity, and strengthen our "four self-confidences".

　　Adhere to the "three unifications" and study textbooks on special topics.

　　The textbook "Introduction" adheres to the educational law, highlights the teaching orientation, pays attention to being close to the cognitive characteristics of young students, and adapts to the acceptance habits of young people. It is an essential book and core textbook for cultivating young students to become builders and successors of Socialism with Chinese characteristics, and has applicability. As the first unified textbook that comprehensively and systematically expounds the Supreme Leader’s Socialism with Chinese characteristics Thought in the new era, colleges and universities across the country should adhere to the "three unifications" to organize special research textbooks, and generally explain the background and actual needs of the unified compilation of textbooks, the framework and theoretical innovation of textbook compilation, so as to provide scientific methodological guidance for teaching courses and using textbooks well.

　　First, we must adhere to the unity of politics and academic rationality.Deal with the dialectical relationship between firm ideals and beliefs and firm truth and beliefs. Believing in truth is the basis and premise of firm ideals and beliefs. Studying textbooks is to profoundly understand the truth power and practical power of Socialism with Chinese characteristics Thought of the Supreme Leader in the new era, strengthen Marxist beliefs, the lofty ideals of communism and the common ideals of Socialism with Chinese characteristics, and further strengthen ideals and beliefs.

　　Second, we must adhere to the unity of value and knowledge.Deal with the dialectical relationship between the principle of reading the original text and learning the course materials. Studying the course materials should be combined with learning the basic principles of Marxism, the principle of reading the original text and learning the "five histories". We should not only learn the main contents of the teaching materials, but also grasp the ideological science system and understand the theoretical philosophy of truth contained in the Supreme Leader’s Socialism with Chinese characteristics Thought in the new era.

　　Third, we must adhere to the unity of theory and practice.Dealing with the dialectical relationship between theoretical guidance and practical development, the purpose of learning is to apply it, and to talk about the theoretical value of Socialism with Chinese characteristics Thought, the supreme leader in the new era, guiding practical development to achieve historic changes and achievements in detail, so as to enhance the sense of practical acquisition, ability improvement and motivation of young people in the new era.

　　Adhere to the "three focuses" and organize research teaching materials

　　Introduction is an important achievement in promoting the construction of the teaching material system of philosophy and social sciences with China characteristics, which reflects the requirements for the integrated education of ideological and political courses in universities, primary and secondary schools, and provides a model for strengthening the construction and management of teaching materials in the new era. The professional research platform of national curriculum textbooks, the key research bases of textbook construction and the textbook research institutions in colleges and universities should gather capable forces to study the textbook Introduction, focus on the major theoretical and practical problems of textbook construction, sort out and summarize mature experiences, summarize and refine basic laws, and promote the construction of a high-quality textbook system to serve and support the high-quality development of education.

　　First, focus on the innovation of teaching material construction mechanism,Carefully sort out all the links in the whole process of management research for editing and reviewing the textbook Introduction, and study the innovative practices and effective experiences in the mechanism of the textbook Introduction from the aspects of writing needs, implementation plan, team formation, discussion and review, publication and use tracking, so as to create an era model for the construction and management of the textbook.

　　Second, focus on the realization of teaching materials to educate people.Accurately grasp the functional orientation of the textbook "Introduction" to cultivate new people in the era, and study the core leading role of the textbook "Introduction" in curriculum integration, teaching integration, evaluation integration and goal integration according to the requirements of ideological and political courses integration in universities, primary and secondary schools, so as to lay the foundation for the realization of all-round education, whole-process education and all-round education.

　　Third, focus on the construction of teaching material discourse system,Fully understand the theoretical value of "Introduction" as an important achievement in the construction of teaching material system of philosophy and social sciences with China characteristics, accelerate the strategic goal of building a discourse system of philosophy and social sciences with China characteristics by benchmarking, study the active exploration of teaching materials in the construction of Marxist discourse system with China characteristics and times, and gradually highlight the China characteristics, China style and China style in the construction of teaching material discourse system.

COVID-19 is still spreading around the world, and prevention and control will become the norm. How to prevent and control it efficiently and finely, and minimize the impact on people, maybe we can make a fuss about health codes.

Now the function and significance of various health codes is actually mainly to provide data by big data statistics. But not fine enough. There are mainly the following problems:

• How to ensure the authenticity of information
• People in high-risk areas are not necessarily high-risk, so high-risk areas should not be divided, but high-risk people should be defined.
• Only people who are in close contact with the confirmed patients are high-risk people. It is most important to inform these people in time and check them out.
• The core of prevention and treatment of infectious diseases is early detection and early isolation. How to find it and isolate it as soon as possible is the most important thing.

Universal testing, screening out all patients, and then centralized treatment, this is the most ideal method. However, based on the actual situation, it is more difficult to realize this. Then set up more detection links, such as the temperature detection of residential buildings, which is this role. When the abnormality is detected, further nucleic acid detection will be conducted. If the diagnosis is confirmed, all close contacts will be screened again to find the car infected person. This should be done quickly and accurately. You can realize all accounts receivable, and you should check everything.

National epidemic prevention requires a national epidemic prevention system. Everyone and each unit play different roles in the whole system. These categories are probably needed in this system:

• Brain center cloud computing platform:Such a large amount of data and responsible data storage certainly need a powerful data storage and technical platform, and China, which has experienced the test of Spring Festival travel rush and the Double Eleven, is not lacking in this ability.
• All-round primary inspection:This requires our Zu Guoqiang’s strong organizational ability to do a good job of detection at every small, building subway and other personnel flow nodes. The main function is to find people with fever and abnormal health codes, and send them for inspection in time if abnormal conditions are found. Do early detection and early isolation.
• Nucleic acid detection:Rapid and convenient detection can expand the detection range. In South Korea, PCR nucleic acid detection method was adopted on January 31st, and the diagnosis result can be obtained in 6 hours. The "drive-through" detection station can detect about 380 people every day. This practice can quickly deal with a large number of testers and effectively reduce the contact between medical staff and high-risk groups. It used to take 30 minutes for each person to test, but now it only takes 10 minutes to complete. This may be used for reference.

Face recognition real name login:Nowadays, whether it is the card opening of financial banks or the real-name authentication of the three major operators, remote face recognition verification has been realized, and the uniqueness of the national ID cards provides a data basis for face recognition. Relying on the camera of smart phone, face recognition login is completed. Thereby ensuring the correctness of the information. Face recognition login+mobile phone verification code. Don’t enter complicated information such as the place of entry, the place of household registration, and the place of residence.

Close contacts real-time storage:Fine epidemic prevention is to accurately find infected people and close contacts with confirmed patients. Now the way to find close contacts is too rude. One person is diagnosed, the whole building belongs to close contacts, and someone in a train is diagnosed and needs close contacts to check the relevant trains themselves. This greatly misses these potential threat groups. Or accidentally injure someone who is not really close to you. Using the Bluetooth technology of mobile phone, you can search for additional Bluetooth devices in real time and upload them for filing. Bluetooth can search for devices within 10-20 meters, and record the contact time of storage devices and the MAC address of devices. Within 10-20 meters, those who have been in contact for more than 60 seconds are close contacts in the true sense.

Real-time location information:The record of real-time location information of mobile phone can tell you where you have been in contact with close contacts when pushing information, and provide information judgment for self-infection rate through self-judgment of personal protective measures at that time.
Real-time push of abnormal information: when someone in close contact with an individual is diagnosed on the 14th, the mobile phone will automatically push the message. The message template involves the following information: time, place, number of contacts, contact duration, and the nearest nucleic acid detection point.

For example:

Hello; At 3:50 p.m. on April 6, 2020, a confirmed patient met with you for about 10 meters for 300 seconds near Chaoyangmen subway in Chaoyang District, Beijing.

Now the nearest nucleic acid detection point is the outpatient department of Chaoyang Hospital. It is recommended that you do a good job of protection and see a doctor immediately.

There are only two states of health code, no abnormality and abnormal. Face recognition login shows the status, which will be invalid after 1 minute. You need to log in again. All residential buildings only need to check the health code, and if there is any abnormal state, they will not pass, and urge them to do nucleic acid testing. If the testing is negative, the hospital data will be restored to no abnormal state after synchronization.

Exception definition:Within 14 days, if there is a confirmed case in the Bluetooth information record, it will be displayed as abnormal.

Eliminate anomalies:Go to the hospital for nucleic acid detection. If it is negative, the hospital data will be uploaded and the abnormal state will be automatically lifted. If it is positive, the system will automatically inform the user to contact the confirmed user, and then inform the contacted user to do nucleic acid testing.

At present, the health code is too rough, and the overall structure is centralized. From top to bottom, it lacks a dimension, that is, information communication between groups. Adding this dimension can realize timely tracking and timely push, and the whole process is more automated, reducing a lot of manual intervention.

To prepare for a protracted war, make full use of existing technical means, give full play to data intelligence, and fine epidemic prevention means to minimize the impact on personnel activities on the premise of accurate positioning. I didn’t mention the issue of data security in the whole article because we can’t give up eating because of choking at this stage. The whole design is still described by big lines. If you have any shortcomings, please brainstorm and comment.

Lao Zhang, everyone is a product manager columnist. AI product manager, focusing on natural language processing and image recognition. Now he is a partner of smart insurance startup company, hoping to communicate with entrepreneurs in the field of artificial intelligence.

This article was originally published by everyone as a product manager, and it is forbidden to reprint without permission.

The title map comes from Unsplash and is based on CC0 protocol.

　　Xinhua News Agency, Beijing, October 8 (Reporter Gao Jing) During the National Day holiday this year, Gao Lei, who works in Beijing, found that his hometown had changed a lot when he went home to visit relatives. Gaoyang County, Baoding City, Hebei Province, where his hometown is located, is undergoing the transformation from coal to gas. Gao Lei saw that the small coal-fired boiler used for heating in winter at home disappeared, and the kitchen was newly connected with natural gas pipelines and installed with wall-hung boilers. The home looked much cleaner and brighter than before.

　　Replacing loose coal by changing gas and electricity is one of the important measures to control air pollution in northern China.

　　Since the "Thirteenth Five-Year Plan", China’s air pollution control has achieved remarkable results. According to the data from the Ministry of Ecology and Environment, compared with 2015, the average annual concentration of fine particulate matter (PM2.5) in cities at or above the prefecture level fell by 23.1% in 2019, and the proportion of excellent days in 337 cities at or above the prefecture level reached 82%.

　　In the closing year, the achievements of the blue sky defense war were even more eye-catching. From January to August this year, the average number of excellent days in 337 cities at or above the prefecture level was 86.7%, up 5 percentage points year-on-year; The concentration of PM2.5 was 31 μ g/m3, down 11.4% year-on-year. Good weather with blue sky and white clouds is becoming the norm.

　　Behind more and more blue sky is a series of "combination boxing" that China has played to control air pollution. In recent years, China’s air pollution control work has been closely focused on key areas such as Beijing-Tianjin-Hebei and surrounding areas, the Yangtze River Delta region, and the Fenwei Plain, focusing on key pollutants such as PM2.5, focusing on key periods in autumn and winter, and key areas such as loose coal combustion and "scattered pollution" enterprises, and continuing to implement tough actions.

　　The pilot cities of clean heating in the northern region will achieve full coverage of Beijing-Tianjin-Hebei and surrounding areas and Fenwei Plain; 86% of coal-fired power units have achieved ultra-low emissions, and about 780 million tons of crude steel production capacity has been transformed into ultra-low emissions; Carry out in-depth rectification of "scattered pollution" enterprises, industrial furnaces and key industries to control volatile organic compounds; Strengthen the pollution control of diesel trucks and vigorously promote the "revolving iron"; Deepen the joint prevention and control of air pollution in key areas and strengthen the response to heavy pollution weather.

　　"The nearby village used natural gas for heating last year, which is said to be clean and warm." Gao Lei said that he believes that after coal is changed to gas, there will be more blue sky and less smog in winter.

　　CCTV News:On the afternoon of April 8, the State Council held a press conference on the traceability research of COVID-19 in China.

　　At the press conference, a reporter asked: What kind of cooperation plan will China have with the international community in the future regarding the investigation and research on traceability? Are there any specific international cooperation arrangements or plans?

　　Zhou Lei, a researcher at China CDC, responded that Covid-19’s traceability is not a matter for one country, nor can it be accomplished independently by one country. It necessarily requires the joint efforts of the global scientific community. Therefore, it is imperative for the whole world to unite, especially for scientists to work together to carry out traceability, which is also necessary and what we have always advocated. We are adhering to an open, objective, scientific and open attitude to cooperate with WHO. We have also invited international experts many times. For example, since 2020, we have invited at least two international experts to China to carry out traceability research. I think this will not change in the future, which is certain.

　　In fact, just now, several of my colleagues have repeatedly mentioned that the first phase of our joint research cooperated with more than 10 international colleagues and top international experts selected by WHO to carry out joint research work, and formed a particularly detailed joint research report for joint release. This is an attitude in itself, and this is our research result. After that, we didn’t stop our research work, and our expectation and efforts to trace the source never stopped. A large number of research results and data we carried out in the later period were shared with our international counterparts in various forms without reservation. We published many scientific papers, shared our sequences and shared our data and information in multiple databases. In addition, we supported the decision of WHO to conduct global joint traceability. We sent experts to collect more data and information, and we have been doing what China can do. In fact, we very, very much hope that global traceability can really become a global traceability. We have repeatedly called for the location and angle of traceability research to cover all possible countries and regions as much as possible, and we should stop speculating and paying attention to Wuhan all the time. We have done a lot of work in this regard, and I have reiterated this many times. China’s attitude has never changed. Traceability research should be an international action. We also very much hope that WHO is an authoritative professional organization and international organization, which can really organize the global traceability work and organize all the elites in the international scientific community with a scientific, rigorous and fair attitude.Let us trace back to Covid-19 and get a convincing answer in the future.