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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.　　看5 妈妈新发售年轻有钱又置身于意大利的艳阳下，这是汤姆·瑞普利（马特·达蒙 Matt Damon 饰）所渴望的生活，却是迪基·格林利（裘德·洛 Jude Law 饰）早已拥有的东西。香荽也软声叫道：大舅舅。1) The management confusion of the development environment is a headache for developers, especially when some teams share the development environment and there are many projects, it will be even more chaotic.