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18. Command Mode然而他却低估自己的影响力了，杠铃般的大笑吸引了坐在村口的闲汉，胡家三兄弟看着杨长帆像疯牛一样奔过去，打招呼都来不及，倒也见怪不怪。After entering the flight simulator, the head-up display (HUD) immediately appears:　下面是一个鸡兔混血的年轻英雄。尽管存在差异，但他渴望融入并感受到被爱，尽管他笨手笨脚，他却沉迷于冒险。田遥这才惊醒，急忙松手让大夫帮国公夫人诊治。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.