A.dF=-SdT-PdV B.dF=dU-TdS C.dF=dG-VdP D.dF=dG-PdV
A.TdS=dU+PdV B.TdS=dH+PdV C.dF=TdS+VdP D.dU=TdS+VdP
A.△S>0B.△S=0C.△S< 0D.不一定