下列说法是正确的是 A.省力机械一定效率高b.省力的机械一定功率大c.使用任何机械都不省功d.功率大的机械效率一定高 题目和参考答案——青 Template




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tomski下列说法是正确的是 a.省力机械一定效率高b.省力的机械一定功率大c.使用任何机械都不省功d.功率大的机械效率一定高 题目和参考答案——青 coloring