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
Vessels wishing to communicate with the Port Health Officer should do（）on VHF Channel 14.
You are making a telephone call ship-to-shore using the VHF-FM service.You can tell that the working channel is busy if you hear（）.
The weather is often（）in a high-pressure area.
The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.
Channel 13 (156.65 MHz)，the designated bridge-to-bridge channel，may NOT be used to（）.
Should that kind of weather（），the two ships would touch each other.
The space in Hatch No.4 tweendeck is too（）.
A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.
I have been instructed that on my voyage（），I shall call at Maderra to pick up some cargo.
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? （）