21.在“探究�轮组机械效率 的实验中用同一�轮组进行了两次实验 实验数据如下表所示 1在表格的空格处填上合适的数据 2 Template




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tomski21.在“探究�轮组机械效率 的实验中用同一�轮组进行了两次实验 实验数据如下表所示 coloring