单项选择题
When choosing extinguishers to fight a Class “B” fire do NOT use（）.
A.carbon dioxide B.dry chemical C.foam (stored-pressure type) D.water (cartridge-operated)
单项选择题 What should be used to steer an open lifeboat if the rudder becomes lost or damaged?（）
单项选择题 Vessel’s provisions refer to（）of the vessel.
单项选择题 To clean a dirty fiber towing hawser used in ocean towing，you should（）.
