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However, these repairs may lead to some data loss and may take a long time.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.四月二十，终于轮到他了。至始至终，贴身护卫的平武都没有说话，一直悄然站在一边恪尽职守。First, restart the iPhone7Plus: Press and hold the power key on the right side of the phone without letting go, and hold and hold the volume down key on the left side of the phone at the same time, and the screen will close. Continue to hold down the above two keys until the screen reopens and the Apple Logo appears.刘邦尚未回答的时候，灌婴已经回来了。In World War II, about 70 million people died directly from the war and war-related reasons (such as disasters caused by the war, famine, lack of medical care and medicine, spread of infectious diseases, conscription, labor recruitment, massacre, etc.) (Europe and Africa accounted for about 2\ 3% of the battlefield. 1\ 3 of the dead in Europe and Africa died in Nazi concentration camps or were massacred and tortured by Nazis, accounting for more than 80% of the total number of civilians and prisoners of war deliberately massacred and tortured by warring parties in World War II).