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第一类永动机不能制造成功的原因是（）。

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第一类永动机不能制造成功的原因是（）。

A.能量不能创造也不能消失

B.实际过程中功的损失无法完全避免

C.能量传递的形式只有热和功

D.热不能全部转化为功

参考答案:

答案：能量不能创造也不能消失

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