单项选择题
If a ship is proceeding towards the magnetic equator，the uncorrected deviation due to permanent magnetism（）.
A.increases
B.remains the same
C.decreases
D.is unimportant and may be neglected
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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
Every vessel should at all times proceed at a safe speed. Safe speed is defined as that speed where（）.
A.you can stop within your visibility range
B.you can take proper and effective action to avoid collision
C.you are traveling slower than surrounding vessels
D.no wake comes from your vessel -
单项选择题
Every vessel shall proceed at a safe speed（）the prevailing circumstances and conditions
A.adapted to
B.used by
C.liable to
D.adaptation to
