单项选择题
A.WCDMA B.GPRS C.CDMA2000 D.CDMA
A.电路交换，电路交换 B.电路交换，分组交换 C.分组交换，电路交换 D.分组交换，分组交换
A.Global Packet Radio Service B.General Packet Radio System C.General Packet Radio Service D.Global Packet Radio System