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When the coil is energized, the iron core attracts the armature and the support plate to move down, and the contact points are turned on or off instantly. The piston rod and the lever slowly decrease due to the influence of the blocking nylon. After a certain period of time, the piston rod decreases to a certain position, and the delayed action contact is pushed by the lever to act, which is in an open state, while the moving contact is closed. The delay time of the relay is the time when the coil is energized until the delay contact completes its action. When the coil is powered off, the relay is restored by the recovery action of the spring.-Routine Auxiliary Examination Item for Physical Examination and Identification of Civil Aviation Flight Students该剧讲述了主人公们分享在英宝高中发生的秘密的故事。The attacker first completes the three-way handshake to establish the connection, but in the last ACK reply of the three-way handshake, the TCP window size is set to 0, and then a data request is made. When the attack target sends the request result to the attacker, it stops the data transmission when it finds that the TCP window size is 0, and sends out a TCP window detection packet to ask the attacker if the TCP window has been updated. Since the attacker will not update the window size, the attack target will always maintain the TCP connection and wait for the data to be sent, and continuously carry out TCP window size detection. When the number of controlled hosts in the botnet is large, Target's connection table will gradually be exhausted, resulting in denial of service.这部剧集尖锐地讽刺了二十出头的墨尔本青年的生活，讲述了三名好友的生活日常：工作、寻找乐趣、身份政治问题、约炮以及疯狂之夜。故事发生在三个月之后，Morgan（去伦敦执行奥运会安保任务）和Garcia（帮助Prentiss搬入新家）从英国归来，发现身边多了一个人——长期在联邦调查局工作的语言学专家Alex Blake正式加入BAU调查组。Alex天不怕地不怕，曾因为和Strauss的矛盾而闹得满城风云。Garcia对这个新来的女人并不看好，但Alex高超的技艺最终让她转变了观念。这是好事情——BAU调查组必须明白「团结才是力量」的道理，否则他们无法面对本季的新威胁。在首集结尾观众会看到，某个反派角色不仅一直在嘲弄他们、骚扰他们，甚至在追猎他们。直到本季的季终集，BAU调查组才有机会与这个狡猾凶悍的对手展开正面对决。