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Half-connection survival time: refers to the longest survival time of entries in the half-connection queue, that is, the longest time from receiving SYN packet to confirming that this message is invalid. This time value is the sum of the longest waiting time of all retransmission request packets. Sometimes we also call the half connection survival time Timeout time and SYN_RECV survival time.　　最佳爆料1900年，一场不对等的战争给当时的国家和人民带来了空前的灾难。那些自诩为文明之国的西方列强趁火打劫，妄图吞霸中国，在他们眼中彼时的中华民族不堪一击，野蛮又虚弱。五十年后，侵略者卷土重来，在鸭绿江的对岸、在海峡的中央，肆无忌惮地嘲笑、窥视。而这一次挡住他们的，正是昔日眼中“野蛮又虚弱”的中华民族。Variable value:5. If you buy the shares of the downward channel by mistake, sell them quickly to avoid further losses. If there is no loss, also quickly quit to wait and see.Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.