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【单选题】
以下关于操作系统的说法正确的是( )。A.
批处理系统是实现人机交互的系统
B.
批处理系统具有批处理功能,但不具有交互能力
C.
分时系统是实现自动控制,无须人为干预的系统
D.
实时系统的重点在于提供良好的人机交互
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