第11题: [单项选择]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 参考答案:C