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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.Then there is Baidu's interview process below ~This terror refers to human nature. Is it not horrible enough for human nature to be so? ?　　一次一次对立的任务，让他们慢慢的了解对方，慢慢的欣赏对方，各自在完成任务的同时，也在进行着相互策反。郑氏和张槐忧心地对视了一眼，低声对他耳语了几句。