如图所示是自行车上两个典型的轮轴装置从图中可知脚踏板与齿轮盘组成了一个省力的轮轴飞轮与后车轮组成了一个费力的轮轴. 题目和参考答案——青夏 Template




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tomski如图所示是自行车上两个典型的轮轴装置从图中可知脚踏板与齿轮盘组成了一个省力的轮轴飞轮与后车轮组成了一个费力的轮轴. 题目和参考答案——青夏 coloring