单项选择题
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（）.
A.Speech
B.Signaling tones
C.A busy signal
D.All of the above
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相关考题
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单项选择题
Do you require any further assistance ? My ship is safe now and no assistance is necessary.This VHF communication generally takes place during（）.
A.salvage operation
B.cargo discharging
C.bunkering
D.towing operation -
单项选择题
（）both anchors.
A.Drag
B.Dredge
C.Weigh
D.Lie -
单项选择题
The control of distress traffic is the responsibility of（）.
A.the owners
B.the charterers
C.the shipper
D.the vessel in distress or of the station that relays the distress message
