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单项选择题
A、GTP/UDP/IP/L2/L1
B、GTP/TCP/IP/L2/L1
C、GTP/SCTP/IP/L2/L1
D、GTP/RLC/MAC/L1
单项选择题
A、Orthogonal Frequency
Division Multiplexing
B、Outstanding Frequency
Division Multiplexing
C、Overwhelming Frequency
Division Multiplexing
D、Orthogonal Frequency
Division Modulation