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Compared with the example of electric lights, file uploading differs in that it will now face more complicated conditional switching relationships. In the example of an electric lamp, the state of the electric lamp is always from off to on and then to off, or from off to low light, low light to strong light, strong light to off. ABCA always seems to follow the rules, so even if you don't use the state mode to write the light program, but use the original if, else to control the state switching, you won't lose yourself in logic writing, because the state switching always follows some simple rules.For example, if you and your boss go to a restaurant to eat abalone, just tell the hotel directly that you want abalone. The hotel is responsible for purchasing and making abalone. In this way, we don't have to make abalone ourselves, thus separating customers from services.The nat table in the following figure is no longer indicated in centos7.We do not encourage divorce, but when a marriage is broken, divorce is the best choice for children.能为丈夫的霸业做出这样好的攻陷，她还是相当兴奋的。6.4? SYN? Cookies