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
正确答案：C
通过极地冰区用破冰拖轮拖带破冰拖轮尾部有特殊的槽口来容纳和固定被拖船的船首这被定义为牢固组合拖带
