单项选择题
A.VoIP B.IPTV/CATV C.AAA D.TDM业务
A.5Km B.10Km C.20Km D.30Km
A.SPWB和SPWB B.SPWA和SPWA C.SPWB和SPWA D.PWD
A.1 B.2 C.4 D.6
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