言0=》.-别宁a如 =j最-+Sr-je-n月=hA 故 R ( ) P f dP Z d P P ZR P R R dP T v T v P R T v RT R h R S T P P T P P P P P P r r [ ] [ 1 ln ] ln 1 { [ ] [ ]} 1 0 0 0 = − + = − =  −         − −        − =    P f RT h R Sr r = + ln 故