A.on
B.at
C.in
D.above
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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
I have been instructed that on my voyage（），I shall call at Maderra to pick up some cargo.
The weather is often（）in a high-pressure area.
My ship（）that port next month.
（），the cargo plan is not well done.
Do you require any further assistance ? My ship is safe now and no assistance is necessary.This VHF communication generally takes place during（）.
（）both anchors.
What is meant by veering the anchor chain? （）
There is a drifting mine（）in position 21 degrees 31 minutes North 124 degrees 20 minutes East.
There is a（）mine in position 50°N，30°W.
All VHF marine band radios operate in the simplex mode，which means that（）.