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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.Article 1 These Provisions are formulated in accordance with the Fire Prevention Law of the People's Republic of China in order to standardize social fire-fighting technical service activities, establish a fair and competitive market order for fire-fighting technical services, and promote the improvement of the quality of fire-fighting technical services.According to the system: upper digestive tract diseases, respiratory diseases, etc.明明应该幸福地生活着，在我的内心深处，却是一起度过青春时代的同级生？廉一直在睡觉。众人大喜，然后纷纷告辞，另找地方玩乐去了。　一个受尽白眼的街头混混（陈创 饰），一个遭到排挤的转校生（郭可轩 饰），孤独失意的两人，在一系列意外中，成为了彼此唯一的朋友。然而生活给了他们不同的难题，当夏天结束的时候，他们的友情似乎也走到了尽头……说笑间，板栗越看周耀辉越觉面熟，纳闷道：周伯父，我们从前没见过？为何晚辈觉得周伯父如此面善呢？周耀辉听后笑道：见是没见过的，怕是在下面容酷似家父的缘故。