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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.《融和不容易 mixed-ish》原定在《喜新不厌旧》美国时间5月7日「Becoming Bow」一集中以后门试映集登场，不过现在此集将抽起改为在正剧中播出。由Peter mingtian6.com Saji及Kenya Barris执笔的《融和不容易》描述Rainbow Johnson（Tracee Ellis Ross饰）在80年代所过的混合种族生活，Rainbow的父母Paul 及Alicia为了更好的家庭生活而从嬉皮士社区搬到郊区，Rainbow及其姐弟入读了当地主流学校，而他们在此既不够黑亦不够白。他发现绿萝更是个犯错的小女孩，请求原谅，他没想到绿萝还有这样可爱的一面。Sourceable source1 = new SourceSub1 ();No.62 Quan Zhilong香荽看着他，奇怪他连这两句话都说不清，问道：可是，写什么呢？毛凡有些心虚，忙叫道：张姑娘就写最近干了些什么，也能练练字不是。