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Re-understanding OO: Object-oriented programming is an idea to think about software design structure with object-oriented thinking, thus strengthening the object-oriented programming paradigm. Object-oriented features are encapsulation, inheritance and polymorphism. "Do these count?" . So from that beginning, when I design a class, I keep reminding myself of the following three points:你武艺平常，专靠毒盐害人。Pressing F8 key during startup is the most traditional and commonly used method: turn on the computer power supply, immediately press F8 key on the keyboard after the hardware completes self-checking, and many advanced startup options are listed here. In this security mode, there are several types. Generally speaking, you can choose to enter the common security mode. In addition to this most commonly used method, you can also start the system in "safe mode" by holding down the Ctrl key when the computer starts.然其中两场大战，一水攻，一火攻，肆意泯灭生灵无数，也令微臣双手沾满鲜血。反正今天兴趣不大。Round 2: 1-3,Benin... end statement blocks, both of which allow us to execute multiple SQL.