单项选择题
When it is accepted to remain on the frequency indicated，you should say（）.
A.Standing by on VHF frequency
B.Coming to VHF frequency
C.VHF frequency. is the best place for you to stay by
D.remaining in frequency. and do not change
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相关考题
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单项选择题
When the changing of a VHF channel / frequency is accepted，say（）.
A.I am going to change to VHF channel
B.I am certainly going to change to VHF channel
C.Changing to VHF channel
D.VHF channel. has been changed -
单项选择题
Our company is a professional one，and you may rely（）it.
A.on
B.in
C.at
D.up
