·另解: n= 2n P PA+PR+Pc=P PB=5(P-Pu 3 中pg2 3 dt d ② dt dh dh d d0(1 2x) dp dt dt dt 3P dt 2×(1+2×0.5)2 ×(-2.4)=2.13kmol/s 3×3• 另解： –② dt dp dt dp p P p p p p P n n p p B A B A A B C B C B C  = −   = − + + = =  = 3 2 ( ) 3 2 2 2   = ? dt dnC kmol s dt dp P n x dt dx n dt dn dt dn A A A A A C A ( 2.4) 2.13 / 3 3 2 (1 2 0.5) 3 (1 2 ) 2 2 0 0  − =   +  = − + = − = = −