2温差电势 EA To T T EB EAT,TO= ki 1 d(Nat w dt E2(T,T0) ki i d(Nat ejn dt A2.温差电势 dt dt d N t e N k E T T T T A A A  = 0 1 ( ) ( , ) 0 dt dt d N t e N k E T T T T A A B  = 0 1 ( ) ( , )0