21 2 =J12-J21=(n 1·6 J1=(C1-C22=mB3(、c=,dC 2 dx D=-62=-la1 2 1  2 1 2  2 1 2 1 J = n J = n   = 1 1 n  C 2 2 2 1 2 1  D =  = a ( ) 2 1 1 1 2 2 1 1 2 J = J − J =  n − n x C C C J C C d d 2 ( ) 1 2 1 ( ) 2 1 2 1 2 2 1 1 2      = − −  = − =