1.在做“测�轮组的机械效率 的实验中小明和同学们测得图中两个�轮组的机械效率不同. 1实验后小明想对于同一个�轮组它的机械效率是否 Template




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tomski1.在做“测�轮组的机械效率 的实验中小明和同学们测得图中两个�轮组的机械效率不同. 1实验后小明想对于同一个�轮组它的机械效率是否 coloring