LTE物理层定义了3种下行参考信号，包括小区专用的参考信号、MBSFN参考信号和（）。
参考答案：终端专用参考信号
— Please tell Bruce he has won the first prize in the maths contest.
— ________! He never did so well before. [ ]
A. Good luck
B. Congratulations
C. That's right
D. What a good surprise
维调的定义？
