oracle终端sqlplus显示乱码问题

sqlplus登陆oracle服务器查询表显示中文是?乱码
SQL> select * from test11;

ID
----------
NAME
--------------------------------------------------------------------------------
111
??

222
??

333
??????

SQL> select userenv('language') from dual;

USERENV('LANGUAGE')
----------------------------------------------------
AMERICAN_AMERICA.AL32UTF8

[oracle@fx ~]$ export NLS_LANG="AMERICAN_AMERICA.AL32UTF8"

SQL> insert into test11 values(334,'张东');

1 row created.

SQL> select * from test11;

ID NAME
---------- --------------------
334 张东
111 肖明
222 吴明
333

SQL> insert into test11 values(335,'吴敏');

1 row created.

SQL> select * from test11;

ID NAME
---------- --------------------
334 张东
335 吴敏
111 肖明
222 吴明
333