2、多层平壁的稳定热传导 △t1△ Q=MA b ,A2-t32R2N A 134 b3 2021/2/21 上页下及2021/2/21 2、多层平壁的稳定热传导 1 1 2 1 b t t Q A − =  A b t 1 1 1   = 1 1 R t = 2 2 3 2 b t t A − = A b t 2 2 2   = 2 2 R t = 3 3 4 3 b t t A − =  A b t 3 3 3   = 3 3 R t =