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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.　　郭一要求卓颖在一天之内训练母亲成一个合格的乒乓球手，以此要卓颖冲破难关。卓颖为求归队，毅然接受这个近乎不可能的任务…借着乒乓的魅力，卓颖逐渐拉近母女的距离。更明白教练与母亲，是支持自己最强大的后盾。　　该片根据安·布拉谢尔的畅销小说改编，讲述了四个妙龄少女和一条会飞的牛仔裤之间的故事。在一个旧货店，他们发现一条适合四个人体形的牛仔裤，虽然四个女孩会在不同的地方度过这个夏天，但是他们决定用这条牛仔裤来维系之间的感情……Note: When running shell commands here, if you want to call variables before python, you can do the following:其中一张桌子后面站着两个少年，正是黄瓜和黄豆，二人正示意护院安排大家排成三队。5.2 for example