Dear sir,

Last year I buy a refrigerator in your store on Chang An Road. We all like shape of the refrigerator. And yesterday something went wrongly. It made a noise when turning on. At first it was low but gradually it became louder and louder. To make matter worse，it even stopped working. We all felt disappointing. I am writing to ask for help. Would you please find someone to repair them? I would be at home this weekend. Please call me before you come to here. My telephone number is 66065531. Thank you very much.

Li Ming

八纲辨证的意义是（）

A.各种辨证的基础

B.各种辨证的总纲

C.内伤杂病的辨证方法

D.外感病的辨证方法

E.各种辨证的病理实质