又Wi=C,=C(c (2分) 故d7=(l/Cp)×[ T-CT]dps 23.5分(1049) [](ap/ansaS/ap)av/a S)p=-1 (aS/ap)y=(aS/a DMaT/ap)y=(CID(aT/ap)r (aasP=(aV/aD(aT/aSp(a V/a DP(T/Cp) 故(ap0=-l/(Sp)h(oWS) (ap/ar 因为(op)n<0,Y=C/Cp>0又 V/T=C, V=CT, ( ) p V T ∂ ∂ =C (2 分) 故 dT=(1/Cp)×[CT-CT]dp=0 23. 5 分 (1049) 1049 [答] ( ∂ p/ ∂ V)S( ∂ S/ ∂ p)V( ∂ V/ ∂ S)p= -1 ( ∂ S/ ∂ p)V = ( ∂ S/ ∂ T)V( ∂ T/ ∂ p)V = (CV/T)( ∂ T/ ∂ p)V ( ∂ V/ ∂ S)p= ( ∂ V/ ∂ T)p( ∂ T/ ∂ S)p= ( ∂ V/ ∂ T)p(T/Cp) 故 ( ∂ p/ ∂ V)U = -1/[( ∂ S/ ∂ p)V( ∂ V/ ∂ S)p] = γ ( ∂ p/ ∂ V)T < 0 (因为 ( ∂ p/ ∂ V)T < 0 , γ = Cp/CV> 0 )