你将会利用下列哪些器件将3个CTU的发射信号合成一路发射出去?()
A.TDF
B.BSC
C.HCU,DDF
D.DDF,FEEDTHROUGH
参考答案:D
All of a sudden, the thief walking behind a young and pretty lady ____ her purse, ____ into the crowd. [ ]
A. seizing; rushed
B. seized; rushed
C. seizing; rushing
D. seized; rushing
雷电防护等级应按哪些方法划分?