单项选择题
How should signal flares be used after you have abandoned ship and are adrift in a liferaft?（）.
A.Immediately use all the signals at once B.Use all the signals during the first night C.Employ a signal every hour after abandoning ship until they are gone D.Use them only when you are aware of a ship or plane in the area
单项选择题 Generally，what is used to inflate liferafts?（）.
单项选择题 Each liferaft，which does not have an indicated maximum stowage height indicated on the liferaft，must be（）.
单项选择题 Each lifebuoy shall be marked in block capitals of the Roman alphabet with（）of the ship.
