单项选择题 If the towing bridle legs are not of equal length（）.

单项选择题 If a vessel under tow starts jumping on its tow line，the most appropriate action to alleviate the condition is to（）.

单项选择题 If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights. These additional lights may be shown if the tow is（）.