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如图所示,在升降机内固定一光滑的斜面体,一轻弹簧的一端连在位于斜面体上方的固定木板B上,另一端与质量为m的物块A相连,弹簧与斜面平行.整个系统由静止开始加速上升高度h的过程中( ) A.物块A的重力势能增加量一定等于mgh B.物块A的动能增加量等于斜面的支持力和弹簧的拉力对其做功的和 C.物块A的机械能增加量等于斜面的支持力和弹簧的拉力对其做功的和 D.物块A和弹簧组成系统的机械能增加量等于斜面对物块的支持力和B对弹簧拉力做功的和
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