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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.Some common behavior methods will be defined in the state class, and Context will eventually delegate the request to these methods of the state object. In this example, this method is buttonWasPressed. No matter how many state classes are added, they must implement the buttonWasPressed method朝野私情，君臣勾结谋天下，康熙遭受蛊惑，夜半惊魂…… 一场浩大壮观的“木兰秋菊”揭开连场残酷皇位争夺战。康熙（陈鸿烈）四子胤禛（郑少秋）深谋远虑，笼络隆科多（铁梦秋）和了因和尚（张振环），暗中布下天罗地网，决与智勇双全的十四皇子胤祀（黄膺勤）争持帝位。时民间反清势力日大，以广慈神尼（刘薇薇）为首的武林高手行刺康熙失败。幸得神秘女侠红姑（刘玉婷）相助脱险。另边厢，禛在机缘下与汉女丝儿（梁铮）结为忘年之交，但后来丝儿获愁禛王子身份，二人微妙关系渐转化。此时禛趁祀驻守西北，布下诡计令康熙惊魂落魄，奄奄一息。最终禛能否偿愿继承帝位，与丝儿的感情在民族大义的猛烈冲击之下，又能否开花结果呢……雍正王、谋江山、诛灭功臣；吕四娘、恩恩怨怨、举剑维艰！ 猜疑心极重的雍正（郑少秋）在擅改遗旨的传言中登基后，大举诛灭夺谪功臣，更大兴文字狱排除异已，吕氏一家亦因此惨遭灭族。吕四娘（梁铮）为报灭门之仇，苦练武功，与其师独臂神尼（刘薇薇）欲刺杀雍正，危急之间，四娘赫然发现雍正乃汉国贤君，终以民族大义为先，与雍正协议Artificial Intelligence Cyber Physical Operating System　　由《风之画员》《来自星星的你》张太侑导演执 导，金璐利编剧执笔。　　面对国际对于外太空资源抢夺形势的加剧，中国政府决心在太空建立永久性空间站，而宇航员正是这项任务的重要执行者。张天聪不仅是新一代航天员的教官，同时也是他们的竞争者。怀揣着“飞天”之梦的张天聪与所有航天员一起经历着种种常人所不能想象的训练。为了进行失重训练，航天员们远赴俄罗斯加加林航天中心，出色的训练成绩赢得了俄罗斯、美国等同行们的尊重。樊哙听得将信将疑，说道：即便这样做了，有用吗？项羽会相信吗？张良知他顾虑，摇头道：信不信由他，但这都是我们必须做的。