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1. First handshake: Establish connection. The client sends a connection request message segment, setting the SYN position as 1 and the Sequence Number as x; Then, the client enters the SYN_SEND state and waits for confirmation from the server.3. The customer groups are students, office white-collar workers, leisure groups, families, couples and other mass groups, 80% of which cover mainstream social groups.三问的新书《宋王》已经上传了。(3) Overview of Play Methods1958年，大跃进时代。钟叶平任青龙水库党委书记不久，既制订出提前一年完成水库竣工的跃进计划。省水利局长陈超人却认为此计划违背科学，不赞成实施。省委倪书记却支持钟叶平的计划，让她组织干部群众调研，拿出可行方案。钟叶平和主观武断的陈超人等据理力争，党办主任苏士荣向省委写信反映陈超人要扒开合拢囗的错误方案，脑羞成怒的陈超人准备撤消钟叶平的职务。关健时刻，倪书记来到工地，他通过调查了解，批评了陈超人等，受了批评的陈超人竟不顾施工安全，搞起“遍地开花”工程，造成溢洪陡坡大面积塌方，血的教训使陈超人受到严肃处理...他依旧递出荷包，笑对冰儿道：这本是周姑娘捡的，还让她拿着。The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.