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2. Pay the signature business handling expenses to Jiangxi Jinge Company's account (please remit money from the Company's account, Jinge does not accept personal account remittance):Industrial Revolution 2.0-Electrical Age: Since the 1870s, marked by the wide application of electricity, human society has entered the "Electrical Age" and initiated a new mode of mass production of products.A TCP connection is a quad, and a connection is uniquely determined by the source IP, the source port, the destination IP and the destination port. Therefore, if C wants to forge the packet from A to B, it should fill in the above-mentioned IP header and TCP header with the source IP, source port, target IP and target port. Here B is the server, IP and port are open, A is the target we want to attack, IP certainly knows, but the source port of A is not clear, because it may be randomly generated by A. Of course, if we can find out the rule of generating source port for common OS such as Windows and Linux, we can still do it. In addition, we can step on the connection port of Car A through a large number of controlled hosts.还没到日子。Finally, refuting the 10,000-hour law can play a clever thought game, which is the Sand Paradox put forward by the ancient Greek philosopher Eubulides:　　但赛特的训练一直不顺利，总是引起纠纷给村子里的人添麻烦。It is an improvement on the common factory method mode. In the common factory method mode, if the passed string is wrong, the object cannot be created correctly, while multiple factory method modes provide multiple factory methods to create objects separately. Diagram: