A.VHF communications are basically line of sight
B.the air is more dense the higher you go
C.salt water is a poor conductor of sound
D.sea water absorbs the radiated energy
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A.Mayday，Mayday，Mayday
B.Pan，Pan，Pan
C.Security，Security，Security
D.Lights out，Lights out，Lights out
A.to get the engine ready
B.to respond to the engine
C.to maneuver the engine
D.to change the engine
A.due
B.because of
C.because
D.since
A.persist
B.persists
C.to persist
D.persisted
A.pay out
B.make fast
C.shorten
D.hold on
最新試題
The generators on your rig have shut down，leaving you without navigation lights. Which emergency signal would you transmit over the VHF radio to alert vessels in the area of your predicament? （）
There is a drifting mine（）in position 21 degrees 31 minutes North 124 degrees 20 minutes East.
Please（）all the lines fore and aft，the vessel is just in her position of the berth now.
There is a VHF set（）the front of the wheelhouse.
Should that kind of weather（），the two ships would touch each other.
Pilot Station，this is Chinese ship Jinsha（）.Over.
Do you require any further assistance ? My ship is safe now and no assistance is necessary.This VHF communication generally takes place during（）.
If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）
What does the abbreviation VHF stand for?（）
What is meant by veering the anchor chain? （）