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�轮组机械效率高低可能与被提物重有关�轮组机械效率高低可能与物体提升高度有关 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�轮组机械效率高低可能与被提物重有关�轮组机械效率高低可能与物体提升高度有关 coloring