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(3) Power on the control coil to detect the contacts. Apply rated voltage to the control coil of the time relay, and then detect whether the contact state changes according to the type of the time relay. For example, for the energized time delay type time relay, after the energized time delay, whether the delayed open contact is closed (the resistance is close to 0) and whether the delayed closed contact is opened (the resistance is infinite)."The rest of the people are drinking and eating. After the meal, I stayed there for a while and went back to sleep. That night I slept in the shop of Jiang Xiaolong, the twelve people above. Jiang Xiaolong didn't let me go down and said, 'You sleep here, don't go down'.The PCB shall ensure that after the components are inserted, the X-direction component edge is at least 3mm away from the board edge of the PCB. If it is less than 3mm, the process edge shall be added. The width of the process edge shall be more than 3mm, but generally not more than 10mm.A former mobster turned businessman and a police detective must contend with a dirty ex-cop looking to bring the killer of his son to justice.One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.