单项选择题
A tug would NOT assist a ship to steer if the tug is made up to the large vessel（）.
A.by a tow line ahead of the vessel B.forward on either bow of the vessel C.approximately amidships of the vessel D.on the vessel's quarter
单项选择题 A towing vessel is tripped when（）.
单项选择题 A towing vessel and her tow are severely restricted in their ability to change course. When making way，the towing vessel will show ONLY（）.
单项选择题 A tow that is properly aligned to pass through a narrow opening between two bridge piers is （）.
