如图所示一根轻弹簧上端固定下端拴一钢球球处于静止状态.现对球施加一个水平�右的外力f使球缓慢偏移在移动过程中的每一时刻都可以认为 Template




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tomski如图所示一根轻弹簧上端固定下端拴一钢球球处于静止状态.现对球施加一个水平�右的外力f使球缓慢偏移在移动过程中的每一时刻都可以认为 coloring