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


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1.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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題How do you determine the weight of the vessel that is supported by the ground when a vessel has run aground?（）

A.This requires extensive calculation and is usually performed only by a naval architect not by a ship's officer
B.Determine the point where aground and the draft at that point，then calculate it using the grounding formula
C.Use the hydrostatic tables and enter with the mean draft before grounding and the mean draft after grounding
D.Use the inclining experiment formula and substitute the change of trim for the angle of list

5.單項選擇題How do the height and location of a tug’s towing bitts relate to the danger of tripping?（）

A.The further forward and closer to amidships the more readily the tug will trip
B.Placement further aft permits more effective pulling，better steering and eliminates the danger of tripping
C.Installing the bitts down low lowers the center of gravity
D.The height and position of towing bitts has no significance