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Modify the above example 3.3. 3 event to be inactive and active againAt that time, The helmets worn by our army are GK80 bulletproof helmets. After understanding, I am sure that Zhang Xiaobo is wearing this model. The material used to make it is 232 bulletproof steel, which has excellent performance and has good protective effect on various high-speed flying hard objects such as fragments and rubble lifted by explosion. However, because it is a pure metal helmet, it does have the disadvantage of being sultry when fighting in hot conditions.《同居损友》是一部都市青春题材的情景喜剧，由爱奇艺独家出品，著名网络作家有时右逝编剧，新锐网络剧导演徐雷执导。讲述的是三男两女，五个身份背景、人物性格各不相同的年轻人，在大学毕业后两年左右共同留在北京，人生事业爱情刚刚起步阶段的故事。[Sorting out the clean and jerk snatch narrow pull high turn down squat turn by force push high grasp support squat overhang turn]大才？惊喜？尹旭有些突兀，怎么到这个时候还不和自己说实话吗？尉缭道：东来莫要在意，因为些许情由，现在不大方便，到时候相见一切都会明了的。In TCP implementation, when receiving the SYN request from the client, the server needs to reply the SYN + ACK packet to the client, and the client also needs to send the confirmation packet to the server. Usually, the initial serial number of the server is calculated by the server according to certain rules or adopts random numbers. However, in SYN cookies, the initial serial number of the server is obtained by hash operation and encryption of the client IP address, client port, server IP address, server port and other security values, which is called cookie. When the server suffers from SYN attack and makes the backlog queue full, the server does not reject the new SYN request, but replies the cookie (SYN serial number of the reply packet) to the client. If it receives the ACK packet from the client, the server subtracts 1 from the ACK serial number of the client to obtain the cookie comparison value, and performs a hash operation on the above elements to see if it is equal to the cookie. If equal, complete the three-way handshake directly (Note: At this time, you don't need to check whether this connection belongs to the backlog queue).