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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.杨祭酒不仅是为民除害。卫斯理为唤醒昏迷的爱人白素,求助于拥有着超凡能力的蓝血星人方天涯。方天涯在三百年前的一次意外中坠落地球,当时和她一起的还有他的爱人洛卡,两人失散。三百年间，方天涯一刻也没有放弃过寻找爱人。作为回报，卫斯理答应帮助她寻找洛卡。该剧讲述的是一个发生在古老图书馆里的故事，六个性格迥异的工作人员遇到了许多离奇事件，展开了一场前所未见的神奇冒险，碰撞出应接不暇的密集笑点，让你猜中了开头，却猜不中结尾。故事主要围绕三个看似互无关联的美国家庭展开，一个“看不见”的摄像师“扛着摄像机”记录他们生活中的点点滴滴。这三个家庭也很有代表性：一个是传统的美国中产阶级家庭，一个是老夫少妻的组合，一个是同性恋家庭。Http://www.freebuf.com/news/67204.html