单项选择题
An ocean towing bridle whose legs are of equal length，but too short，may（）.
A.fail to provide spring in the hawser B.cause unequal distribution of the load to one leg C.cause the bridle legs to jump clear of the chocks or fairleads D.None of the above
单项选择题 A sail plan，including the vessel’s itinerary，name，number，and persons aboard，should be filed with（）
单项选择题 A gas-free certificate would usually be issued by a(n)（）.
单项选择题 Which vessel when anchored at night，would not be required to show anchor lights? （）
