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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.王哥。HBO宣布续订《难以伺候》第二季，该喜剧讲述一个布鲁克林的大麻供应商，他为患上神经衰弱症的客户提供大麻。Ben Sinclair饰演「The Guy」，一位友好的大麻供应商，他的客户有着形形色色的人，剧中揭晓他们的生活。Delicate mind:我爹要是说了一件事，我娘说不好，我爹马上就说‘那咱们不弄了。Observer mode is also called publish-subscribe mode