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理论告诉我们权力越大,责任也越大;(4) Electronic time relay is also called electronic time relay, which uses delay circuit to delay. This relay has high precision and small volume.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.The following is the definition of the factory method: an interface is defined to create an object, but the subclass decides which one to create. The factory method defers this process of creating objects to subclasses.At that time, I was blindfolded and thought I was going to be hurt. I dallied, Liu Guiduo has returned to the captain's cabin. He sat by the bed, looking very tired and feeling a little relaxed, and told me 'nothing, we will go to Japan in two days, you also don't be afraid, your hands are not stained with blood, this will help you return home and finish, back to the company what you like to say, we go to Japan also don't matter, kill people, can run whenever.' After that, he added, 'Go to the kitchen and cook some noodles. After that, everyone is hungry. Eat some first'. "Disadvantages: Not fond of tidying up