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可是，这打弹弓跟弯弓射箭自然不能比。巍子、秦岚全力携手拯救“红色危情”，著名导演罗雷继《成都往事》之后又一倾情力作……D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:People have studied SYN attack prevention technology earlier. To sum up, there are mainly two categories, one is through firewall, router and other filter gateway protection, the other is through strengthening TCP/IP protocol stack protection. However, it must be clear that SYN attacks cannot be completely prevented. What we have done is to reduce the harm of SYN attacks as much as possible unless TCP protocol is redesigned.The size and layout of the room are appropriate. For example, all the participating members have seats and can communicate face to face (U-shaped or round table rooms can be used). Everyone can see the contents on the slide very well.付宇锋忍不住爆出粗口，这两兄弟一见面，竟然就这样火拼起来。