北京市东城区普通校2014届高三物理12月联考试题新人教版
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1．一质量为m的物块静止在倾角为θ的斜面上，现对物块施加一个垂直于斜面向下的恒力F，如图1所示，物体仍保持静止。则物块
A．受到的支持力不变
B．受到的支持力减小
C．受到的摩擦力不变
D．受到的摩擦力减小
...点击查看全部>>
A．受到的支持力不变
B．受到的支持力减小
C．受到的摩擦力不变
D．受到的摩擦力减小
...点击查看全部>>
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