用一根不可伸长的轻绳系一个小球将小球拉至图示位置a由静止释放则小球在�动到最低点b的过程中重力对小球做功的瞬时功率a.始终减小b.始终 Template


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tomski用一根不可伸长的轻绳系一个小球将小球拉至图示位置a由静止释放则小球在�动到最低点b的过程中重力对小球做功的瞬时功率a.始终减小b.始终 coloring