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【单选题】
以下说法正确的是A.
理想气体自由膨胀与外界热交换 . 功交换皆为零，所以熵保持不变
B.
系统在 PV 图上经历逆时针循环，则系统一定对外作负功
C.
系统经历任一不可逆过程，系统的熵总是增加的
D.
系统从状态 a 经历不同的热力学过程到达 b ，与外界热交换各不相同，因此熵变也各不相同
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