单项选择题
A.transmit B.to transmitting C.transmitting D.in transmitting
The emergency communication set’s transmitter should no...
单项选择题The emergency communication set’s transmitter should not be tested except when（）by a public radio inspector.
A.inspecting B.inspected C.inspects D.having inspected
Which expression has the different meaning from entry i...
单项选择题Which expression has the different meaning from entry into force ? “entry into force” means is（）.
A.coming into effect B.moving to full effect C.being based on force D.coming into force
Radar bandwidth is normally（）to the range scale and the...
单项选择题Radar bandwidth is normally（）to the range scale and the associated pulse length.
A.fixed B.matched C.fitted D.equal
