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【单选题】
H 2 和 O 2 以2:1的摩尔比在绝热钢瓶中反应生成 H 2 O ,此过程中下面哪个表示式是正确的 ( )A.
D H = 0
B.
D H< 0
C.
Q < 0
D.
D U =0
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