3 月 17 日消息，微信 for Windows 3.6.0 正式版已经发布，可以查找微信号并添加朋友。

更新内容如下：

-可以查找微信号并添加朋友;
-可以通过截图来识别二维码或小程序码;
-可以识别图片中的多个二维码和小程序码;
-修复了一些已知问题。

官网下载地址：

https://pc.weixin.qq.com/

BIO

优点 可以接收更多连接 缺点 线程内存消耗 cpu调度消耗

NIO

优点 规避多线程问题 缺点 C10K，弊端: 假设 1万个连接 只有一个发来数据每循环一次 必须向内核发送1万次recv的系统调用 那么这里有9999次是无意义的，浪费的，消耗时间和资源的(用户空间向内核空间的循环遍历，复杂度在系统调用上)

多路复用器

select 1024限制 ，poll 无限制
epoll
jdk1.5及以上 epoll_create 内核中开辟空间FD,红黑树 epoll_ctl add(accept) epoll_wait 阻塞(timeout) 等待文件描述符上的事件
AIO JDK1.7中，这部分内容被称作NIO.2 AsynchronousSocketChannel read/write方法都是异步的，完成后会主动调用回调函数 异步非阻塞，服务器实现模式为一个有效请求一个线程，客户端的I/O请求都是由OS先完成了再通知服务器应用去启动线程进行处理，

三者应用场景

BIO 连接数目比较小且固定的架构，对服务器资源要求比较高，并发局限于应用中，JDK1.4以前的唯一选择，但程序直观简单易理解。
NIO 连接数目多且连接比较短（轻操作）的架构，比如聊天服务器，并发局限于应用中，编程比较复杂，JDK1.4开始支持。
AIO连接数目多且连接比较长（重操作）的架构，比如相册服务器，充分调用OS参与并发操作，编程比较复杂，JDK7开始支持。

转载请说明出处

On March 8, according to the Science and Technology Daily, the second "Minister's Channel" of the Fifth Session of the 13th National People's Congress opened today. Minister of Science and Technology Wang Zhigang brought you good news about new crown drugs and vaccines.

Wang Zhigang revealed that broad-spectrum drugs against coronavirus or new coronavirus are being actively developed; vaccination through nasal spray and inhalation is also under study, and there is good progress now.

Wang Zhigang said that China has always adhered to five major directions to carry out scientific research, including vaccines, drugs, testing, animal models and scientific traceability.

In terms of vaccines, there were 3 inactivated vaccines and 1 adenovirus vector vaccine with conditions, and this year, another recombinant protein vaccine was listed with conditions. There are also two technical routes that have made positive progress. One is mRNA vaccines, which have entered Phase III clinical trials; the other is DNA vaccines, which have also entered Phase III clinical trials. This is an important achievement achieved by the majority of scientific researchers with their level, integrity, dedication and perseverance.

In terms of drug research and development, 1 neutralizing antibody drug has been marketed with conditions, and 3 small molecule drugs have entered Phase III clinical trials. In addition, there are some neutralizing antibody drugs, small molecule drugs, and traditional Chinese medicines, which are all under active research and development, showing good prospects.

In terms of detection, sample detection can be completed in as little as 30 minutes, and an integrated detection system can detect 200,000 samples a day, greatly improving the capability.