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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.本片根据已故作家陈忠实的同名小说改编。十九岁的护校女生张天玉（王丽坤饰）阳光美丽、纯真善良，她正面临毕业，一心准备进一步深造。天玉九岁时父母双亡，一直由姐姐带大，在姐姐像母亲一样的呵护照顾下天玉并不像一般孤儿那样苦闷内向。姐姐张天洁在红日影视集团做当红影星罗文凯的经纪人，这引来了很多同学的羡慕。她们生活得平静而温暖，然而，一场突如其来的车祸完全打乱了天玉的生活……我初吻都给你了，那你再赔个吻给我。事实上，喜欢玩网游的人还要超过喜欢玩单机游戏的人。没了军队，他还有什么凭恃？项羽叹道：只能如此了，我本意是把他拉进来一起，再顺手除掉他的三万秦国边军，没想到反被他挤兑。