单项选择题
A METHOD OF TOWING VESSELS THROUGH POLAR ICE BY MEANS OF ICEBREAKING TUGS WITH A SPECIAL STERN NOTCH SUITED TO RECEIVE AND HOLD THE BOW OF THE VESSEL TO BE TOWED defines（）.
A.Towing operations
B.Rigid coupled towing
C.Close coupled towing
D.Hard coupled towing
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相关考题
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单项选择题
A MARK OR POSITION AT WHICH A VESSEL IS REQUIRED TO REPORT TO ESTABLISH ITS POSITION defines（）.
A.VTS point
B.Way point
C.Reference point
D.Establishment point -
单项选择题
（）will the discharging operations take?
A.How long
B.How length
C.How many times
D.How many shift -
单项选择题
（）will reduce the visibility.
A.dust
B.sea water
C.land sand
D.wind
