4.设矩阵A= a 1 3 0 1 b 0 0 2 与矩阵B= 1 0 0 1 1 1 1 -1 3 相似,则 ()-|||-y-|||-(A) =2, =-3; (B) =2, neq -3; (C) neq 2, =-3; (D) neq 2b=