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During the establishment of a tcp connection, If the server returns syn and ack messages, The client does not confirm it for some reason. This is because the server needs to retransmit the syn + ack message and wait for the client's confirmation message until the tcp connection timeout. This state of waiting for the client to confirm the connection is usually called a half-open connection. The half-open connection will be kept in the connection table of the server until the connection is disconnected.Reading study and research, especially the study of the notes of geniuses, celebrities and great men, found that the notes of geniuses are not a pile of dry words, but illustrated with pictures and texts."Er... how do you say this, In terms of appearance, it should be regarded as common, but the physique is much larger than the common. The kind of rats that drill in the ground is a kind of big rats. They fly like big wasps in the sky. They are all in groups, and they are very fast and flexible. They are not easy to hit with guns. Once surrounded by them, they are basically finished. " Zhang Xiaobo said.1. Creator: FactoryPizzaStore as defined above. It is an abstract class, which defines the method of creating objects. This method is an abstract method, and the specific process of creating objects is implemented by its subclasses. This abstract class usually relies on an abstract Product (another role in the factory method pattern) class. These abstract products are made by subclasses, and the creators do not care what kind of products are made.该剧从四名刚刚迈入大学校园的女生的视角展开，讲述了她们在大学四年中的成长故事。　　在正和从食品公司辞职后一年，接替前辈正和的山岸（太贺饰）身兼区域经理和“鸡肉百姓”的店长两职，每天都很忙，不过，他做事仍然我行我素，活得悠然自得。某天，为接受电视剧《宽松世代又如何》的编剧采访，山岸作为宽松世代的代表造访电视台。对于其他参加者的发言他嗤之鼻，还说了他自己起诉同事的事情，让制作人和编剧听得津津有味。助理制作人须藤冬美（佐津川爱美饰）奉上司的命令，对山岸进行补充采访。冬美憧憬着由此完成由自己策划的电视剧，干劲儿十足，为了搜集素材她和山岸开始交往。Light tube shot in automatic mode