單項(xiàng)選擇題How does the effect known as “bank suction” act on a single-screw vessel proceeding along a narrow channel?（）

A.It pulls the stern toward the bank
B.It heels the vessel toward the bank
C.It pushes the entire vessel away from the bank
D.It pulls the bow toward the bank


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題How do you operate a portable CO2 fire extinguisher?（）

A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin，squeeze grip