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(3) The principle of electric time relay is similar to that of clocks and watches. It is delayed by the internal motor driving the reduction gear to rotate. This kind of relay has high delay accuracy and wide delay range (0.4 ~ 72h), but its structure is complicated and its price is very expensive.As Poplar prepares for Christmas, the nuns leave for the Mother House to vote in a new mother superior and to help care for a group of Chinese orphans. Meanwhile, Trixie returns to Poplar refreshed and is shocked to discover that many mothers no longer want to give birth at home.殊不知做出这样的决定，刘邦下了多大的决心，叹息着送走了张良，又含泪将家人送去做人质。你徐家在其中到底做了些什么，寡人一定会查个水落石出，如果今日你想要以此来蒙骗寡人，那么结果之能是徐家会死的更惨。Explanation of Terms:二十世纪七十年代，黄河岸边的祥符市，一座医院里发生了一件匪夷所思的事情。一名叫吴宜飞的妇产科护士，十月怀胎却不知道胎儿的父亲是谁？在那个年月，未婚先孕可谓“惊世骇俗”。在医院领导和同事们苦口婆心的“帮助”下，吴宜飞誓死不愿说出那个种下“恶果”的男人是谁。当“执迷不悟”的吴宜飞被父母赶出家门无处可去的时候，她投奔了她的同事，也是密友的何美丽。何美丽对吴宜飞未婚先孕深恶痛绝，但是她对生命的热爱使她放弃了自己的“原则”。在医院保卫科追查吴宜飞行踪的过程中，何美丽成了“同案犯”……