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Time relays are divided into two types: on-time delay type and off-time delay type, and their symbols are shown in the following figure. For the power-on delay type time relay, when the coil is powered on, the power-on delay type contact acts after the delay time (the normally closed contact is opened and the normally open contact is closed), and the contact immediately returns to normal after the coil is powered off; For the power-off delay type time relay, when the coil is powered on, the power-off delay type contact acts immediately (the normally closed contact is opened and the normally open contact is closed). After the coil is powered off, the contact will not return to normal until the delay time is passed.三更求粉。云州知名企业晋红实业的办公大楼上，一个身上捆着炸药的男子扬言要炸楼，警官张旭光情急之下抱着男子跳下大楼。紧接着，特案大队又接到一个报案，晋红实业财务总监被杀身亡，弃尸荒野。调查中，警方又获悉晋红实业的董事长钱晋被绑架，后被人偶然救出。种种迹象都表明，晋红实业背后隐藏着重重黑幕。警方展开了对晋红实业的秘密调查。事实上，晋红实业的掌舵人吕京红，陷身在一团乱麻中，公司经营状况堪忧，脱困回来的丈夫“钱晋”性情大变。这个钱晋，到底是真是假？他身后隐藏了多少秘密？谜团一个接着一个。特案大队、吕京红、以及晋红实业的幕后老板，都对这个“钱晋”展开了追查。追查过程中，各方势力相互角逐，风波迭起。最终警察掌握了晋红实业非法炒汇和非法集资的证据，大案胜利告破。而真假钱晋之谜也水落石出，最后的真相令人唏嘘!原来杨肉白和牛和是两个江湖小混混。初到云州，杨肉白就被人当成晋红实业的董事长钱晋给绑了票，而真正的钱晋早已跟情人卷了公司帐上的钱，偷渡到了国外，隐姓埋名，双宿双飞。牛和机敏地断定这是一个行骗的好机会，撺掇杨肉影片主要讲述了心存梦想的刘小二终于开始了自己憧憬过无数遍的大学生活，五个来自天南地北不同性格，习惯和家庭背景的女孩凑到了一起，开始了有欢笑和泪水，有梦想的大学时光。性格外向的班长吴静喜欢上了同班的坏小子肖张并展开了一系列的追求。但肖张却发现自己爱上了刘小二而拒绝了吴静的示爱，自尊心极强的吴静由此对昔日的好闺蜜，好室友刘小二万般排挤，带头孤立她。导致刘小二因为种种压力选择了退学....《复仇者联盟3：无限战争》是漫威电影宇宙10周年的历史性集结，将为影迷们带来史诗版的终极对决。面对灭霸突然发起的闪电袭击，复仇者联盟及其所有超级英雄盟友必须全力以赴，才能阻止他对全宇宙造成毁灭性的打击。