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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.　　在肤浅的爱情泛滥的年代，在人们相信金钱可以买到爱情的世上，在如今为了眼前利益放弃大义也算美德的污浊风气之下，金处善的一生，他的自我牺牲式的爱与忠诚更彰显出他的人格魅力。Of course, if the average trainer is not heavy, it is not a big problem to choose which shoes. However, with the improvement of results, the problem of shoes should be considered.ReplayWhen the client SYN packet arrives at the filter gateway, the SYN agent does not forward the SYN packet, but actively replies the SYN/ACK packet to the client in the name of the server. If the client's ACK packet is received, it indicates that this is normal access. At this time, the firewall sends the ACK packet to the server and completes three handshakes. The SYN agent actually replaces the server to deal with SYN attacks. At this time, the filter gateway itself is required to have strong ability to prevent SYN attacks.