单项选择题
A.4DSP,1PPC B.1DSP,4PPC C.1DSP,3PPC D.3DSP,1PPC
A.MFS;SGSN B.BSC;MFS C.BTS;MFS D.MS;MFS
A.MFS;SGSN B.BSC;MFS C.BTS;SGSN D.BTS;GGSN