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The attacker first forged the address to initiate a SYN request to the server (can I establish a connection?) The server will respond with an ACK + SYN (Yes + Please confirm). The real IP will think that I did not send the request and did not respond. The server does not receive a response and will retry 3-5 times and drop the connection after waiting for a SYN Time (typically 30 seconds-2 minutes).15.3 The visual field is abnormal and unqualified.讲述三个反传统的洛杉矶女人（40多岁好朋友）不约而同跑到克里夫兰，又不约而同住进了同一间房子。当她们意识到当地人觉得她们「很有魅力」后，便决定留下来生活。Betty White扮演她们三人在克里夫兰（农场）的邻居，脾气不好，在那块土地上已经生活了50年。666, congratulations1. In the process of movement and change of things, some features appear repeatedly many times, and the time taken for them to appear twice in a row is called "cycle". Periods are divided into mathematical cycles, chemical cycles, physical cycles, biological cycles, economic cycles and other types.