单项选择题
A.1Gbps B.2Gbps C.4Gbps D.6Gbps
A.SEAMLESS VOICE HANDOVER B.CIRCUIT SWITCHED SERVICES VIA UU C.COMMON A-BIT INTERFACE D.4D SCALABILITY
A.状态由ECM-CONNECTED到ECM-IDLE B.信令和用户面连接释放 C.RB释放 D.以上所有