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【单选题】
凡是在孤立系统中进行的变化,其 Δ U 和 Δ H 的值一定是A.
Δ U = 0 ， Δ H 不确定
B.
Δ U = 0 ， Δ H = 0
C.
Δ U > 0 ， Δ H > 0
D.
Δ U < 0 ， Δ H < 0
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A.
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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