为什么�托车的前齿轮比后齿轮要小,而自行车却相反,如果�托车前齿轮大于后齿轮不是能速度更快吗? 知乎 Template




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tomski为什么�托车的前齿轮比后齿轮要小,而自行车却相反,如果�托车前齿轮大于后齿轮不是能速度更快吗? 知乎 coloring