单项选择题
A.2 B.3 C.4 D.5
A.S1AP B.SCTP C.UDP D.GTP-U
A.serious O&M defficiency B.short outage,24小时内出现2分钟以上的
A.MME and PGW. B.OSS and VAS. C.SGW and PGW. D.OSS and DPI.
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