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Explain the template method mode, which means: in an abstract class, there is a main method, and then define 1... n methods, which can be abstract or actual methods, define a class, inherit the abstract class, override the abstract method, and realize the call to subclasses by calling the abstract class. First look at a diagram:In the termination phase of TCP connection, four interactions with FIN messages are usually used to cut off the connection with the client and the server. However, when one of the client or the server is abnormal, it will not be able to complete four waves to terminate the connection. At this time, RST messages will be used to forcibly interrupt the connection.The printed board must be marked every time it is revised. Add a "*" after the version number for each revision.Club Friday原为一档电台节目，后改编成系列剧，多为真人真事。　　无巧不成书，“风景”不是别人，正是林菲的弟弟林强。以开网店为业的林强游手好闲，整日沉迷网络。自邂逅了姐姐的同事毛娜后，便穷追猛打最终娶Non-banks also need to be vigilant,During the practice, the students of the practice team also visited several migrant workers' families. Dark walkways, crowded houses and messy furnishings are their first impressions of these families. Parents are busy with their work and their academic qualifications are not high. They are often unable to pay attention to their children's education. This kind of family environment makes the team members very worried about the children's study and life. At this time, Zhou Hailan, a junior high school student, came into their sight. Among the students interviewed, she was the one with the worst financial conditions in her family, but she was the one who studied most diligently. But she can't take the senior high school entrance examination in Shanghai. No matter how good her grades are, there will be no high school to accept her without the necessary financial conditions. Not only her, but all the children of migrant workers studying in Shanghai have the same problem of entering a higher school. What is their future? The players, like Zhou Hailan, are at a loss...