单项选择题
A.1 B.2 C.3 D.4
A.SGSN B.BSC C.MSC/VLR D.BTS
A.38.4kbit/s B.64kbit/s C.115kbit/s D.384kbit/s
A.GGSN动态IP地址池资源不足 B.DNS不能翻译APN C.用户鉴权失败 D.GGSN拒绝
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