8.如图所示为一皮带传动装置右轮半径为ra点在它的边缘上.左轮半径为2rb点在它的边缘上.若在传动过程中皮带不打�则a点与b点的�心 Template




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tomski8.如图所示为一皮带传动装置右轮半径为ra点在它的边缘上.左轮半径为2rb点在它的边缘上.若在传动过程中皮带不打�则a点与b点的�心 coloring