单项选择题
A.GMSC Server B.MGW C.MSC sever 或者 MGW D.MSC Server
A.Overload Frequency Division Multiplexing B.Orthogonal Frequency Division Multiplexing C.Overwhelming Frequency Division Multiplexing D.Outstanding Frequency Division Multiplexing
A.15MHZ B.25MHZ C.22MHZ D.35HZM