1.一物体沿光�斜面下�在此过程中 A. 斜面对物体的弹力做功为零 b.斜面对物体的弹力的冲量为零 c.物体动能的增量等于重力所做的 Template




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tomski1.一物体沿光�斜面下�在此过程中 a. 斜面对物体的弹力做功为零 coloring