单项选择题
How does foam extinguish an oil fire?（）
A.By cooling the oil below the ignition temperature
B.By removing the fuel source from the fire
C.By excluding the oxygen from the fire
D.By increasing the weight of the oil
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相关考题
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单项选择题
How does an icebreaker normally free a ship which has become beset while navigating independently?（）
A.By backing down the track and cutting out ice on either bow
B.By approaching from the stern and crossing ahead at an angle of 20° to 30° to the beset ship's course
C.By overtaking the beset ship，running ahead and then backing down the track to the beset vessel
D.By approaching the vessel from astern and towing the beset vessel stern first -
单项选择题
How does a vessel’s rate of turn change when entering shallow water?（）
A.It is faster
B.It is slower
C.There is no change
D.It remains constant for varying propeller revolutions -
单项选择题
How does a coast radio station communicating by HF radio normally identify itself?（）
A.By its subscriber number
B.By its call sign
C.By its MMSI
D.By its MID
