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
If it（）fine tomorrow，we shall start unloading.
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? （）
All VHF marine band radios operate in the simplex mode，which means that（）.
The present voyage of my ship began at the port of Shanghai after loading 8 000 tons of Cargo on board and ended after discharging the Cargo at the port of Hong Kong，which was（）.
Some goods are missing（）terrible weather.
Should that kind of weather（），the two ships would touch each other.
What does the abbreviation VHF stand for?（）
A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.
（）your present speed?
The weather is often（）in a high-pressure area.