一皮带传动装置如图所示右轮的半径为ra是它边缘上的一点.左侧是一轮轴大轮的半径为4r小轮的半径为2rb点在小轮上到小轮中心的距离为 Template




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tomski一皮带传动装置如图所示右轮的半径为ra是它边缘上的一点.左侧是一轮轴大轮的半径为4r小轮的半径为2rb点在小轮上到小轮中心的距离为 coloring