单项选择题
A.MME B.SGW C.PGW D.UE
A.UE B.PGW C.SGW D.MME
A.MME B.PCRF C.eNodeB D.RNC
A.172.27.45.251,10.1.32.192 B.172.27.45.250,10.1.32.192 C.172.27.45.250,10.1.33.192 D.172.27.45.251,10.1.33.192
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