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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.　　一直被人类囚禁的「三尖树」们获得了自由，它们开始在这个星球表面四处游荡－－带着它们致命的毒刺，还有对人肉的「嗜好」。「三尖树」的数量与日激增，人类面临灭顶之灾。在这个关键时刻，Bill Masen博士挺身而出，为人类的生存争取最后的希望。Three people in a single round robin, a total of three matches机灵鬼答应一声，送他出点心铺子，叫上大头鬼和吊死鬼，上马往松山去了。项羽短暂的情绪波动，众人都为注意到，除了尹旭稍有察觉外，还有一个人把握的分明。第一卷附赠OVABe cautious in the end and pursue the far.