UE在下面那个阶段完成了无线复帧同步（）。
A.PSS同步
B.SSS同步
C.PRACH同步
D.PBCH解读
参考答案：D
Simon prepared _____ a letter to ask Jim for some _____. [ ]
A. to write, advice
B. to write, advices
C. writing, advice
D. writing, advices
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