一半径为r的光�圆环固定在竖直平面内环上套两个中央有孔的小球a和bab间由质量不计的原长为r的细弹簧连接着它们处于如图中的位置时恰好都 Template




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tomski一半径为r的光�圆环固定在竖直平面内环上套两个中央有孔的小球a和bab间由质量不计的原长为r的细弹簧连接着它们处于如图中的位置时恰好都 coloring