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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.1941年我军截获日军准备进攻太行山土匪山寨青龙寨的情报，指派兵工厂厂长赵刚查明情况。赵刚尾随日军密探来到了青龙寨，却被当作奸细被抓。寨主之女赵红花不愿嫁给山寨的接班人江大龙与赵刚合作出逃，日本人趁机占领青龙寨。红花将拯救山寨的希望放在国军营长唐淮川身上，却迟迟等不来支援只得率部攻山救父。赵孔武为掩护女儿红花牺牲，赵刚救出了红花，红花加入了八路军。独立团成立，赵刚任政委还带来了未婚妻杨柳青，红花被迫收起对赵刚的好感。一次战役中，杨柳青因破译日军电文失误导致独立团遭重创，杨柳青失踪。红花帮助悲痛的赵刚走出低谷，两人的感情升温时，杨柳青却回到了独立团。日军利用杨柳青的求胜心切设计陷害，赵刚营救杨柳青遇险，杨柳青为保护赵刚牺牲，临终前真心祝福红花和赵刚。红花和赵刚带领独立团终于击败日军夺回了青龙寨。影片的主人公是一位并没有给出姓名的女人。她和两位朋友以及她们养的狗一起来到阿尔卑斯山脚下度假。安顿下之后,朋友提议出去散步,而她因为驾车的疲倦决定赶早睡下。第二天早上醒来之后,她发现朋友们整夜未归,而只有小狗卢齐思陪在她身边。担心的她想到旁边的村子打听消息,却发现她被一道看不见的屏障封闭了在这里,根本无法离开。电台中断,电话失去了信号,她必须做出决定,究竟是冒死翻过身后的高山去寻找和外界的联系,还是留在这里避免外界看不见的危险?或许是太过兴奋，以至于忘记了杀人灭口……………，中年fù女拿起金饰犹豫了片刻，匆匆走上山道，来到山村了一个小院里。CAD drawings drawn for Tianzheng 6 and above versions need to be saved in the old version (command: LCJB) and saved in T3 format before being imported into Sketchup for editing. Otherwise, entities such as walls, columns, doors and windows will not be imported into Sketchup.This is original method!