A.H+
B.H-
C.
D.
答案:C
The old tower must be saved, ______ the cost. [ ]
A. however
B. whatever
C. whichever
D. wherever
发射机输出功率为P1,通过传输环节到达天线的功率为P2,那么传输损耗绝对值L=()。
A.10㏒P1P2
B.10㏒P2P1
C.10㏒P1-P2P1
D.10㏒(P1-P2)