均相封闭系统热力学函数之间的4个基本关系式为？
·dU = TdS – pdV
·dH = TdS + Vdp
·dA = – SdT – pdV
·dG = – SdT + Vdp

多选题
·dU = TdS – pdV
·dH = TdS + Vdp
·dA = – SdT – pdV
·dG = – SdT + Vdp