imp导入时的字符问题

[yourwp]

dmp的log文件：
Export done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
server uses UTF8 character set (possible charset conversion)

sys的prop$
NLS_CHARACTERSET WE8MSWIN1252 character set
NLS_NCHAR_CHARACTERSET AL16UTF16 NCHAR character set

imp时出现：
IMP-00016: 不支持要求的字符集转换（从类型178到852）
IMP-00000: 未成功终止导入