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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

（）both anchors.

A.Drag
B.Dredge
C.Weigh
D.Lie

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