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【单选题】
关于熵,下列叙述中正确的是
A.
298 K 时，纯物质的 S m Θ ＝ 0
B.
稳定单质的 S m Θ ＝ 0
C.
对孤立体系而言， Δ rS m Θ > 0 的反应总是自发进行的
D.
在一个反应过程中，随着生成物的增加，熵变增大
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