单项选择题
Fuel oil tank vents are fitted with a screen which will stop（）.
A.oil from flowing out of the tank vent B.air from entering the tank vent C.vapors from leaving the tank vent D.flames on deck from entering the tank vent
单项选择题 Freeboard is measured from the upper edge of the（）.
单项选择题 Forecastle deck is located in the ship’s（）.
单项选择题 Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.
