ΔS=nCp，mln(T/T)+nRln(p/p)A.ΔS=nCp，mln(T/T)+nRln(p/p)B.ΔS=nCV，mln(p/p)+nCp，mln(V/V)C.ΔS=nCV，mln(T/T)+nRln(V/V)D.ΔS=nCp，mln(T/T)+nRln(p/p)℃时，mol理想气体等温膨胀，压力从p$变到p$，体系吉布斯自由能变化多少