單項選擇題How is the annual rate of change for magnetic variation shown on a pilot chart?（）

A.Gray lines on the uppermost inset chart
B.Red lines on the main body of the chart
C.In parenthesis on the lines of equal magnetic variation
D.Annual rate of change is not shown


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1.單項選擇題How is a safe water mark，that can be passed close aboard on either side，painted and lighted?（）

A.Black and white stripes with an interrupted quick flashing light
B.Black and red stripes with a Morse (A) light
C.Black and red stripes with an interrupted quick flashing light
D.Red and white stripes with a Morse (A) light

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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