质量相同的两小球分别用长l和2l的细绳挂在天花板上分别拉起小球使绳伸直�水平状态然后轻轻释放.当小球到达最低位置时 A.两球运动的线 Template




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tomski质量相同的两小球分别用长l和2l的细绳挂在天花板上分别拉起小球使绳伸直�水平状态然后轻轻释放.当小球到达最低位置时 a.两球运动的线 coloring