单项选择题
在个人计算机即PC机中常安装DOS系统软件，DOS名词源于英文词组，DOS是（）英文词组的简称。
A.Disk Operating System
B.Driver Operating System
C.Chinese Words System
D.Editor System
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单项选择题
A.Disk Operating System
B.Driver Operating System
C.Chinese Words System
D.Editor System
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