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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.杨长帆摆手道，今后若是跟他有来往，翘儿你回避便是了。So, according to the above thinking, let's summarize what functions each "level" has.　　胡雪岩（1823年—1885年），名光墉，字雪岩，安徽绩溪人，晚清时期的红顶商人。见秦嘉的脸色越来越阴沉，这名属下略微停顿，继续道：末将敬业治愈，详细询问过问过镇上的居民，才知刘季昨夜确实到到达的微山镇。　　梦想着有朝一日成为母亲那样伟大的探窟家，并解开阿比斯的谜团。