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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.　　她仿佛落入了永世轮回的诅咒之中，无法超生……这是一次史诗般的浪漫冒险，以比利的生活为基础，从他卑微的爱尔兰血统，以及他早期在美国边境当牛仔和枪手的日子，到他在林肯县战争和其他战争中的关键角色。只有张翠山一脸早知如此的样子。When Liu Guangyuan and other four people finished laying new mines and were ready to return, The Vietnamese army launched a new round of attacks. The main force of this attack was still those "living biological weapons" similar in appearance to "dogs". Among the soldiers responsible for continuing to stick to their positions, gunner Wang Zeduan saw very clearly because he was deployed on a higher favorable shooting terrain. In the interview, he recalled:陈启一字一顿，说道：侠之大者，为国为民。