A.Help，Help，Help
B.Mayday，Mayday，Mayday
C.Save，Save，Save
D.Rescue，Rescue，Rescue
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A.on
B.at
C.in
D.above
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
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
A.on
B.in
C.at
D.up
最新試題
（）your present speed?
All VHF marine band radios operate in the simplex mode，which means that（）.
Should that kind of weather（），the two ships would touch each other.
Channel 13 (156.65 MHz)，the designated bridge-to-bridge channel，may NOT be used to（）.
My ship（）that port next month.
There is a（）mine in position 50°N，30°W.
What is meant by veering the anchor chain? （）
Pilot Station，this is Chinese ship Jinsha（）.Over.
The control of distress traffic is the responsibility of（）.
What does the abbreviation VHF stand for?（）