单项选择题
Canvas sails，when not in use，may be damaged if（）.
A.left in the sunlight B.stowed wet C.folded frequently D.washed with soap and water
单项选择题 An ocean towing bridle should（）.
单项选择题 A tow bridle is attached to the main tow hawser at the（）.
单项选择题 A term used to describe the dip in a towline that acts as a shock absorber is（）.
