A.Calling frequency
B.Distress frequency
C.Urgency frequency
D.Working frequency
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A.to be
B.is
C.will be
D.has been
A.at
B.by
C.in
D.on
A.home
B.family
C.China
D.returning
A.cast
B.to cast of
C.cast off
D.to cast off
A.OCK TOW BER
B.O RI AN
C.OSS CAH
D.OA KAM
最新試題
（）your present speed?
Should that kind of weather（），the two ships would touch each other.
The weather is often（）in a high-pressure area.
There is a（）mine in position 50°N，30°W.
A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.
Do you require any further assistance ? My ship is safe now and no assistance is necessary.This VHF communication generally takes place during（）.
The control of distress traffic is the responsibility of（）.
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? （）
One hour before arrival at Elbe 1 light vessel，masters are advised to contact the pilot boat by（）.
All VHF marine band radios operate in the simplex mode，which means that（）.