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
单项选择题 When the changing of a VHF channel / frequency is accepted，say（）.
单项选择题 Our company is a professional one，and you may rely（）it.
