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当时。(four) did not record the changes of registered fire engineers or the catalogue of fire technical service items, issued a written conclusion document;才道：请王爷放心，老朽自会教导他。开心女鬼郑裕玲，整蛊作怪、笑料百出！尹旭反倒是被说的有些脸红了，只不过是利用了自己出身上的一些优势而已，结果老是让别人以为自己是天才。The attacker first forged the address to initiate a SYN request to the server (can I establish a connection?) The server will respond with an ACK + SYN (Yes + Please confirm). The real IP will think that I did not send the request and did not respond. The server does not receive a response and will retry 3-5 times and drop the connection after waiting for a SYN Time (typically 30 seconds-2 minutes).The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows: