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：【答案仅供学习，请勿对照自行用药等】

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