13.如图所示是自行车传动机构的示意图其中a是大齿轮b是小齿轮c是后车轮. �假设脚踏板的转速为nrs半径为r0则大齿轮的角 Template




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tomski13.如图所示是自行车传动机构的示意图其中a是大齿轮b是小齿轮c是后车轮. �假设脚踏板的转速为nrs半径为r0则大齿轮的角 coloring