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1951年秋，志愿军保卫干部陆飞从朝鲜战场复员归国。他被重新分配到西南某城市的公安部队去做公安干部，这时他意外得知了自己的身世。从小就是孤儿的陆飞从来没有亲人，组织上告诉他，他的母亲叫赵金迪，此时就在陆飞被派往工作的那个城市。陆飞归心似箭，立即踏上了寻亲的路程。西南某城市，公安部队科长董成正在进行一次对敌特的诱捕行动。女特务邓有恩被董成抓捕后，同意配合公安部队抓捕更大的特务头子。因为她有严重心脏病，市医院院长赵金迪亲自带医生对其看护。敌特一方制造混乱，抢走了邓有恩，并造成是赵金迪放走邓有恩的假象。赵金迪受怀疑而被捕。陆飞回到这个城市，他没想到从没在自己记忆中出现过的母亲正被怀疑成特务。报到后他成为董成的部下。董成对新来的这个同事很不友好，故意当着陆飞的面审讯赵金迪。赵金迪坚决否认自己是特务，并说出自己是一个为解放这个城市立过功的党的地下工作者。恼怒的董成对陆飞使用激将法，陆飞主动提出要审问赵金迪。董成故意向赵金迪说出了陆飞的身份，母子俩在审讯室里相见，母亲又欣喜又悲伤，但她无法解释清楚女Translator's preface这事还是我俩先闹起来的。我爸和许阿姨都很好相处的，你想说什么就说什么呗。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.小果蔬们都笑了。