如图所示在粗糙斜面顶端固定一弹簧其下端挂一物体物体在a点处于平衡状态.现用平行于斜面�下的力拉物体第一次直接将物体拉到b点第二次将 Template




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tomski如图所示在粗糙斜面顶端固定一弹簧其下端挂一物体物体在a点处于平衡状态.现用平行于斜面�下的力拉物体第一次直接将物体拉到b点第二次将 coloring