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单选题
The principal danger from ice collecting on a vessel is the（）.
A
decrease in capabilities of radar
B
decrease in displacement
C
adverse effect on trim
D
loss of stability
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distress alertB
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单选题Which statement is TRUE concerning the danger signal?（）.A
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单选题A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral 4 when the vessel（）.A
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enter the pack on the windward side where there is a well defined ice edgeB
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单选题What is the principal danger from the liquid in a half full tank onboard a vessel?（）A
Corrosion from the shifting liquidB
Rupturing of bulkheads from the shifting liquidC
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Holing of the tank bottom from the weight of the shifting liquid
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单选题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 bowB
By approaching from the stern and crossing ahead at an angle of 20°to 30°to the beset ship's courseC
By overtaking the beset ship，running ahead and then backing down the track to the beset vesselD
By approaching the vessel from astern and towing the beset vessel stern first
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