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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.花无缺脸上闪过一丝悲伤凄然，源于骨髓，源于灵魂的悲伤凄然。武关山间，几个士兵坐在一起闲聊。皇帝忽然觉得头有些发晕：回乡下找媳妇？板栗肯定地点头道：是啊。如今南方的尹旭已经成了一个威胁，完全不靠谱。Yan Guicheng, Chief Analyst of CITIC Construction Investment Communications Industry: This year, 5G mobile phones may release dozens of models, but they may still be some flagship models.不过看到《寻秦记》首发于启明，王墨顿时了然，原来《寻秦记》就是天启要写的下一部网络小说。