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【多选题】
如图所示, 图 物体在斜面上受到平行于斜面向下的拉力 F 作用,沿斜面向下运动,已知拉力 F 大小恰好等于物体所受的摩擦力,则物体在斜面上的运动过程中
A.
做匀速运动
B.
做匀加速运动
C.
机械能保持不变
D.
机械能减小
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