单项选择题

下列两个热力学变量的表达式,其中(    )是正确的。
   A.
   B.

A.B.174.24.96:6088/Latex/latex.action?latex=bG5caGF0e2Z9X2k9XGxlZnRbIFxmcmFje1xwYXJ0aWFsIChubG5mKX17XHBhcnRpYWwgbl9pfSBc%0D%0AcmlnaHRdX3tULHAsbl9qfQ%3D%3D'
C.D.174.24.96:6088/Latex/latex.action?latex=bG5cZ2FtbWEgX2k9XGxlZnRbIFxmcmFje1xwYXJ0aWFsIChuR15FL1JUKX17XHBhcnRpYWwgbl9p%0D%0AfSBccmlnaHRdX3tULHAsbl9qfQ%3D%3D'
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