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TCB (TCP? Transport Control Block is a transport protocol data structure that contains all the information of the connection (in fact, in many operating systems, it is a queue used to process inbound connection requests. The queue holds TCP connection items that are in a half-open state and items that have established a full connection but have not yet been extracted by the application through an accept () call). The amount of memory occupied by a single TCB depends on the implementation of TCP options and other functions used in the connection. Usually a TCB has at least 280 bytes, which in some operating systems has exceeded 1300 bytes. The SYN-RECEIVED state of TCP is used to indicate that the connection is only half open, and the legality of the request is still questioned. An important aspect worth noting here is that the size of TCB allocation space depends on the SYN packets received-before the connection is fully established or the return reachability of the connection initiator is verified.　　这些不同种族、不同文化、不同社会背景的士兵不得不远离家乡和亲人，来到东南亚热带地区接受血与火、生与死的战争考验，剧中充满让人震惊的血腥场面，向人们展现了战争的残酷无情，揭示了人们对战争的态度和兵士们对自己生命价值的思考。《新青年》横跨1907年至1927年20年中国历史，讲述江流（朱亚文 饰）、魏国（蒋恺 饰）、王应（齐奎 饰）、周鲁（刘向京 饰）等一群自强不息、敢于担当的新青年，为人民谋求福祉、为国家探索理想、为民族找寻出路而矢志不渝、百折不回的曲折历程。The adapter for the interface is as follows: Sometimes we write an interface with multiple abstract methods, When we write the implementation class for the interface, All methods of the interface must be implemented, This is obviously wasteful at times, Because not all methods are what we need, Sometimes only a few are needed, In order to solve this problem here, we have introduced the adapter mode of the interface. With the help of an abstract class, the abstract class implements the interface and all methods. However, we do not deal with the original interface, but only get in touch with the abstract class, so we write a class, inherit the abstract class and rewrite the methods we need. Take a look at the class diagram:刚刚走出大学校门的本恩对前途十分茫然，偏偏在这时遇上了风流的鲁滨逊太太。虽然不再年轻，但鲁滨逊太太却一再勾引本恩，二人发生了关系。他们在约会过程中，本恩遇上了太太的女儿伊莱恩，被她的纯真青春深深吸引。本恩吐露了爱意，与伊莱恩开始了正常的恋爱关系，却遭到了鲁滨逊太太的剧烈反对。母亲的震怒使伊莱恩觉察到了一些内情。伊莱恩非常伤心，仓促同意了另一个人的求婚。本恩冲向伊莱恩结婚的教堂，他要力挽狂澜……Now there is a rule in the INPUT chain that rejects all messages from the 192.168. 1.146 host. If we configure another rule after this rule, the latter rule stipulates that all messages from the 192.168. 1.146 host will be accepted, then will iptables accept messages from the 146 host? Let's try it.