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1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.Second handshake: when the server receives syn packet, it must confirm the SYN (ack=j+1) of the customer, and at the same time it also sends a SYN packet (syn=k), that is, SYN + ACK packet. At this time, the server enters the SYN_RECV state;When setting up the network, the network cable has to pass the test of "nine bends and eighteen bends". Therefore, when we choose the network cable, we should choose the network cable as soft as possible, and will not break it by folding it casually. Generally speaking, as long as the network cable meets the standard, the flexibility of the network cable can meet the requirements of wiring. That is to say, under the protection of the outer skin, the network cable will not break so easily, and it can also bear certain pulling force.抬起头来。Peter Boyd探长指挥着一支经过多种训练的警探和科学家的警察队伍-悬案小组，使用现代的方法和原来调查时还没有的新科技来专门调查的未破获的老谋杀案。在动物仙子（简·霍洛克斯 Jane Horrocks 配音）和小叮当（梅·惠特曼 Mae Whitman 配音）的帮助下，动物们浩浩荡荡的迁徙到了冬森林，冬森林实在是太美丽了，小叮当瞬间就被迷住了。还不如现在就主动撤军，保存实力的好。