单项选择题
Finally，when your ship is alongside，don’t forget（）.
A.having rat guards properly mounted on your moorings B.to have rat guards properly mounted on your moorings C.to have rat guards properly mounting at your moorings D.having rat guards proper mounted on your moorings
单项选择题 An ocean towing bridle whose legs are of equal length，but too short，may（）.
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)（）.
