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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单项选择题
