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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.There are two initial reasons:1939年内蒙古与东北交界处的荒漠。抗日英雄燕双鹰为报家仇与汉奸土匪交战，发现隶属日军“731部队”的人体试验室“208防疫站”，正在用中国人试验可怕的“二号病毒”并用之制成细菌炸弹。为了粉碎日军阴谋，打击投敌的土匪，燕双鹰与国民政府特派员周晓英一同深入几股土匪的聚集地五龙镇。周晓英想收编这些土匪为己所用，为此大耍手段。燕双鹰要消灭土匪和日军试验室，孤军奋战，百折不挠。二人斗智斗勇，又相互敬佩。最终，燕双鹰带领抗日武装，与日军和老刀把子、刘大麻子，东山好等几股土匪展开艰苦卓绝的战斗。大漠深处，铁路线上，208防疫站，处处都是他们的战场。燕双鹰的勇气和毅力鼓舞着战友们，几番折挫，几番奋起，最后，他带领着同志们与汉奸土匪在五龙镇展开决战，终于消灭了这几股投敌卖国的匪帮，铲除日军试验室，将“二号病毒”烧为灰烬。UnicomObject sender=10;Orange: madder, goldthread (coptis chinensis), onion, peach...