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If an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.新版《爱丽丝梦游仙境》的故事发生在爱丽丝上次梦游仙境的十三年后，已经20岁的爱丽丝去一个庄园参加一个聚会，到了那里她才发现自己会当着众宾客被人求婚。爱丽丝选择了逃跑，她跟着一只白兔钻进了一个洞，来到了“仙境”，虽然7岁那年她曾来过这里，但此时已毫无印象。有一大帮爱丽丝的朋友欢迎她的归来，他们期待着爱丽丝能帮助他们推翻“红桃皇后”的统治。In addition to M movement, there is also a method of fast movement: select the block to be moved, click the left mouse button, drag to the required position and release it, so as to achieve the purpose of fast movement. This method is much more convenient for movements that do not require precise positions.从来不笑的总裁大人身上竟然挂着两个萌宝，听说还是亲生的？到底谁才是妈妈？某天，国内鼎盛大名的设计师竟与总裁相遇，二人竟然还有如此一段前缘….(2) Fire safety assessment agencies can engage in regional fire safety assessment, social unit fire safety assessment, large-scale activity fire safety assessment, special fire design scheme safety assessment and other activities, as well as fire laws and regulations, fire technical standards, fire hazard rectification and other aspects of consulting activities.The great influence or help is unknown. At least introduce and exchange some experience and knowledge for everyone to share.