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Proxy: Proxy is also a group of hosts that attackers invade and control. They run attacker programs on them and accept and run commands from the master. The proxy host is the executor of the attack and really sends the attack to the victim host.　　大龄未婚的仇家珠，对年轻貌美的新嫂子横竖看不入眼，在婆媳之间推波助澜。新媳妇小娇善良，面对着婆婆小姑挑战，左推右挡。几个女人中夹着男人仇家宝最为尴尬。于是从新婚的这天起便趣事不断，揭开了一幕喜怒哀乐的生活剧……心中那叫一个郁闷与伤感，却也只能埋在心里，夜半无人处暗自伤感。Deployment/retraction landing gear G G only works if the landing gear of the current aircraft is retractable.The ack reflection attack can be carried out by using the ack response of the server side of the three-way handshake.The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.