同学们在探究“影响�轮组机械效率高低的因素 时提出了下列假设1�轮组机械效率高低可能与动�轮重有关 2�轮组机械效率高低可能与被物重 Template




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tomski同学们在探究“影响�轮组机械效率高低的因素 时提出了下列假设1�轮组机械效率高低可能与动�轮重有关 2�轮组机械效率高低可能与被物重 coloring