记者从23日的新闻发布会上获悉，东方航空公司MU5735航班的一部黑匣子已于23日被发现。

人民日报记者从发布会上获悉，事故现场已找到一部失事飞机黑匣子， 由于已找到的黑匣子破损严重 ​​​​，所以暂不确定是数据记录器（FDR）还是驾驶舱话音记录器（CVR）。

3月21日晚上时段，微信团队发布iOS版微信 8.0.19 内测版，该版本需要通过 TestFlight 下载安装才能体验微信内测版，注意的是！这种内测都是有名额限制，如果想提前体验，可直接安装，资料会覆盖。

iOS 微信 8.0.19 内测更新什么？

• 扫一扫页面添加图标文字
• 看一看新增视频（视频号）页面
• 搜一搜页面改进
• 公众号消息显示阅读量和点赞
• 直播新增测试专栏优先级排序

扫一扫页面添加图标文字
在iOS版微信8.0.19内测版本中，扫一扫页面图标新增文字显示，之前是没有文字显示，现在直接显示了，预防一些用户不知道该功能的用途。

搜一搜页面改进如图
在iOS版微信8.0.19内测版本中，搜索页面进行改进，取消朋友圈、文章、公众号、小程序、音乐、表情和微信指数版块。

其它细节大家可以体验，感知不大

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/

On March 16, the Financial Stability and Development Committee of the State Council held a special meeting to study the current economic situation and capital market issues. The meeting was chaired by Liu He, Member of the Political Bureau of the CPC Central Committee, Vice Premier of the State Council, and Director of the Finance Committee. Responsible comrades from relevant departments attended the meeting.

The meeting pointed out that under the current complex situation, the most important thing is to insist that development is the top priority of the party to govern and rejuvenate the country, adhere to economic construction as the center, adhere to deepen reform and expand opening up, adhere to the principles of marketization and the rule of law, and adhere to the "two Unswervingly", earnestly protect property rights, fully implement the spirit of the Central Economic Work Conference and the deployment of the National "Two Sessions", coordinate epidemic prevention and control and economic and social development, keep the economy operating within a reasonable range, and maintain the stable operation of the capital market.

The meeting examined related issues. Regarding macroeconomic operation, we must implement the decisions and arrangements of the CPC Central Committee, effectively invigorate the economy in the first quarter, proactively respond to monetary policy, and maintain moderate growth in new loans. Regarding real estate enterprises, it is necessary to timely research and propose effective and effective response plans for preventing and resolving risks, and propose supporting measures for the transition to a new development model. Regarding China Concept Stock, the regulatory agencies of China and the United States have maintained good communication, and have made positive progress, and are working on forming a specific cooperation plan. The Chinese government continues to support various types of companies to list overseas. Regarding platform economic governance, relevant departments should improve the established plans in accordance with the principles of marketization, legalization, and internationalization, adhere to seeking progress while maintaining stability, and steadily advance and complete the rectification work of large platform companies through standardized, transparent, and predictable supervision. Both red and green lights must be set up to promote the stable and healthy development of the platform economy and improve international competitiveness. Regarding the stability of Hong Kong's financial market, the regulators of the Mainland and Hong Kong should strengthen communication and cooperation.

The meeting emphasized that the relevant departments should earnestly undertake their own responsibilities, actively introduce policies that are favorable to the market, and prudently introduce contractionary policies. Respond in a timely manner to hot issues that the market is concerned about. Any policy that has a significant impact on the capital market should be coordinated with the financial management department in advance to maintain the stability and consistency of policy expectations. The Finance Committee of the State Council will, in accordance with the requirements of the Party Central Committee and the State Council, step up coordination and communication, and conduct accountability when necessary. Financial institutions must proceed from the overall situation and firmly support the development of the real economy. Long-term institutional investors are welcome to increase their shareholdings. All parties must deeply understand the significance of the "two establishments", resolutely implement the "two maintenances", maintain the long-term trend of the healthy development of China's economy, and jointly maintain the stable development of the capital market.

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。

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