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【单选题】
关于 Windows 窗口的概念,以下叙述正确的是( )
A.
屏幕上只能出现一个窗口，这就是活动窗口
B.
屏幕上可以出现多个窗口 , 但只有一个是活动窗口
C.
屏幕上可以出现多个窗口，但不止一个是活动窗口
D.
屏幕上可以出现多个活动窗口
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