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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.　　他从没想过，如此极端乖张的做法会将自己和他人带向何方……先前犹如阎罗恶鬼一般的倭寇，怎么一下子就这样了。When the incident occurs, the incident will begin to spread. Why should it be spread? Because the event source itself does not have the ability to handle the event. For example, when we click one, a click event will be generated, but the button itself cannot handle the event (nonsense). The event must be propagated from the button to reach the code that can handle the event (for example, we give the onclick attribute of the button the name of a function, that is, let the function handle the click event of the button).唉，你们家也没几个人Sonia是一个商业配乐创作者，她经常幻想去过一个精彩刺激的人生。在突然间收到花心大萝卜男友的求婚之后，Sonia必须要做出选择，是加入她的已婚朋友的行列，还是勇敢追求她幻想已久的生活？