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【多选题】
热力学第二定律的实质是：A.
提出了热力工程的方向、限度和条件
B.
热能不能全部转变成机械能，可以部分转换
C.
非自发的热力过程也可以发生，只要补偿条件满足热力学第二定律即可
D.
是关于能量质量的一个定律
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