关于轮轴和斜面下列说法中正确的是a它们一定是省力机械b都可能成为费力机械c轮轴一定是省力机械斜面可作为费力机械使用d斜面一定是省力 Template




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tomski关于轮轴和斜面下列说法中正确的是a它们一定是省力机械b都可能成为费力机械c轮轴一定是省力机械斜面可作为费力机械使用d斜面一定是省力 coloring