h9。=∫(2n-mP和h9=∫n-hP 所以)=(%%( )  = − P Z d P 0 ln    1 ln 和 ( )  = − P Z d P 0 0 0 ln  1 ln 由于 ( )   = ,0 ,0 0 , ,    h V f Z T V Z T 所以 ( )   = ,0 ,0 0 , ,      h V f T V T