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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.强、鹏、伟本是街边小流氓，因误会而结识，意气相投，结为异姓兄弟，因屡受黑社会势力所迫，决定由鹏投考警界，强、伟从旁协助。 　　//Create Original ClassMost of the reasons for divorce are not domestic violence and infidelity as we think, but seemingly trivial things.