单项选择题
If you do NOT understand the course or intention of an approaching vessel you should sound （）.
A.one short blast
B.one prolonged blast
C.not less than five short blasts
D.not less than five prolonged blasts
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相关考题
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单项选择题
If the PSCO from general impressions or observations on board has（）for believing that the ship，its equipment or its crew do not substantially meet the requirements，the PSCO should proceed to a more detailed inspection.
A.clean report
B.serious deficiencies
C.clear ground
D.detention report -
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 -
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
