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【单选题】
如果系统经过一系列变化,最后又变到初始状态,则这一变化过程的________。
A.
Q = W = 0 , Δ U = 0 , Δ S ≠ 0
B.
Q ≠ W , Δ H = 0 , Δ S = 0
C.
Q = W ≠ 0 , Δ H = 0 , Δ S = 0
D.
Q ≠ 0 , W = 0 , Δ U = 0 , Δ S ≠ 0
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B.
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C.
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A.
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