Insert Chinese Special Character gibberish ？？？

[jianjun yang]

Hello, Everybody. I Want to ask you a question? thanks.

We use Windows clicent , character set is GBK.
Server is Linux, MySQL 5.6.17 community edition, database character set is utf8.

SHOW VARIABLES LIKE 'character%'

Variable_name Value
------------------------------------------
character_set_client utf8
character_set_connection utf8
character_set_database utf8
character_set_filesystem binary
character_set_results utf8
character_set_server utf8
character_set_system utf8
--------------------------------------------

When insert Standard Chinese character, data show normal.
e.g.
create table testgbk(nm varchar(20) charset utf8);
insert into testgbk values('测试'),('我们’）;
select * from testgbk;

result:
测试
我们

When insert Special Chinese character:  , ,  ,, data show gibberish.
insert into testgbk values(''),('');

result:
?
?