如图所示表面光�半径为r的半球固定在水平地面上球心o的正上方oˊ处有一个无�擦定�轮轻质细绳两端各系一个小球挂在定�轮上两小球平衡时 Template




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tomski如图所示表面光�半径为r的半球固定在水平地面上球心o的正上方oˊ处有一个无�擦定�轮轻质细绳两端各系一个小球挂在定�轮上两小球平衡时 coloring