sql*plus不能正常使用

若NLS_LANG的值设置为SIMPLIFIED CHINESE_C![CSDN移动问答][1]HINA.ZHS16GBK,就是这样的

SQL*Plus: Release 11.2.0.1.0 Production on ╨╟╞┌╦─ 6╘┬ 5 21:43:44 2014

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╟δ╩Σ╚δ╙├╗º├√: scott
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Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

若改成American,就无法识别中文,中文存进去就成了问号,几个意思?