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On personal computers, there are five most commonly used operating systems: DOS, Windows, Unix/Xenix, and OS/2. DOS System-In the 17 years since its inception in 1981, DOS has undergone 7 major version upgrades, from version 1.0 to version 7.0 now, continuously improving and perfecting. Windows System-Windows is the first generation of window visual interface published by Microsoft in November 1985, which makes PC enter the so-called GUI (Graphical User Interface) stage. Unix system. Unix systems were initially used on small and medium-sized computers. Unix is a multi-user system, which generally requires more than 8M of memory and a large capacity of hard disk. Linux system-Linux is the largest free software in the world at present. It is an operating system with functions comparable to UNIX and Windows and has complete network functions.遵义会议”召开前夕，红军的一支特遣队来到赤水河地区开展敌后工作。这支队伍的主要任务是为了保存红军的有生力量，在当地发展壮大红军队伍。但是国民党嗅出了红军特遣队的目的，派出爪牙古月贵在当地组建民团，企图就地消灭红军。当地既有土匪和民团等敌对势力，再加上百姓对红军的误解，特谴队可谓身陷前有堵截后又追兵两翼有埋伏的绝地。就在如此险恶的环境下，红军特遣队与敌斗智斗勇，同各方巧妙周旋，不但杀出了绝地而且发展壮大了红军队伍，走向光明。怎么了？付宇锋问道。胡镇却一把抓住他不放。这老鸡汤煨了大半天，我先把肉骨头全捞起来，把油撇去了，再拿纱布滤了好几道，只留下清汤。