选择题：下列过程哪一个是准静态多方过程

题目内容：

下列过程哪一个是准静态多方过程 A PV=C1
B P=C
C PVr=C2
D PVn=C3

参考答案：

在绝热压强不变非体胀功等于零情况下，过程进行的方向为：

在绝热压强不变非体胀功等于零情况下，过程进行的方向为：A 内能增大B 焓减小C 内能减小D 焓增大

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