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Facing TCP's three-way handshake protocol, how should attackers launch attacks? The attacker first intentionally initiated a handshake packet. After receiving it, the server puts it into the waiting queue and returns an acknowledgement. Secondly, the attacker will no longer send the third acknowledgement packet, thus the server will make multiple retransmissions (the Linux system configures the number of retransmissions through tcp_synack_retries), consuming a lot of extra overhead, and the waiting queue will be occupied, even the waiting queue will be full, eventually causing the server to be unable to receive the client's request. This is the attack.我说老钱，为了你小命着想，还是不要欺负人了。It's the ticket gate. The ticket gate of Nagoya subway is no different from that of China. It looks like this:愤青这就不服了，凭什么啊就没听见。Analysis: If the two references are the same object, function and array, they are equal. If the references are not the same object, function and array, they are different, even if the two objects, functions and arrays can be converted into exactly equal original values.南极，一场坠机，婚庆公司老板吴富春（赵又廷 饰）和高空物理学家荆如意（杨子姗 饰）相遇，两个毫无共同语言的男女在南极腹地无人区冒险生存75天。在酷寒、没有物质供应、随处都是绝境的环境中，活下去已经变成每一天的最大愿望。在寻找救援的过程中，这对性格水火不容但命运却又相濡以沫的人，敬畏了自然，领悟了爱情。