RAB是指用户面的承载，不用于UE和CN之间传输的是（）
A.语音
B.数据
C.多媒体
D.信令
参考答案：D
Mary said she was looking forward as much to his return as he himself to ________ her. [ ]
A. have seen
B. saw
C. seeing
D. be seen
什么叫附面层的分离？分离的根本原因是什么？
