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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:The first packet discarding scheme will have a slight impact on the user experience, because discarding the first packet retransmission will increase the response time of the service. In view of this, a better TCP Proxy scheme has been developed. All SYN data messages are accepted by the cleaning equipment and processed according to the SYN Cookie scheme. The IP address that successfully established the TCP three-way handshake with the device is determined to be a legitimate user to join the white list. The device disguises the real client IP address, completes the three-way handshake with the real server, and then forwards the data. However, if there is no IP address that shakes hands with the device three times within the specified time, it is determined that the malicious IP address is blocked for a certain period of time. In addition to SYN Cookie combined with TCP Proxy, the cleaning equipment also has the ability to detect a variety of abnormal TCP flag bit packets, and identifies normal access and malicious behavior by returning unexpected responses to SYN messages to test client responses.妻子是秘密摘下犯罪之芽的特殊班女刑警，丈夫是非常喜欢家务的推理作家！夫妇这一最强的搭档，轻松解决了附近和外出时发生的各种各样的事件和谜团！今天也在自己家的客厅，全家出动的‘搜查会议’！东王杨秀清日益骄纵，觊觎天王宝座，北王韦昌辉借力杀人;而洪秀全也私心颇重，使得北王杀骨干两万余人;翼王石达开被迫带兵分道扬镳，牺牲在大渡河畔.此后，虽然有陈玉成，李秀成的艰苦奋斗，但至终敌不住中外统治者疯狂进攻，1864年洪秀全病逝，太平天国也随之瓦解…..板栗就看着她笑了。一部偷盗拐骗的教科书，一伙奉行着诚实正直的人不骗，要填饱贪欲，永远为自己着想，作案不是为了金钱等原则的英国绅士淑女们呈现给观众的眼球大餐——Hustle 还在为NBC的新剧HEIST被腰斩而痛心吗，停止悲伤吧，喜欢偷盗题材的剧迷看好了，英国BBC公司2004年出品的HUSTLE是同题材的上佳之作，一个由偷盗精英所组成的偷盗团伙，每一集里都上演悬念迭出，惊心动魄，精彩纷呈的偷盗戏码。在最后一刻，理智战胜了愤怒。