单项选择题
（）the moving parts on the davit of the lifeboat.
A.Greasing B.Grease C.Greasy D.Greased
单项选择题 If there is a fire in a hold, what should you do?（）
单项选择题 （） must know the location as well as the operation of the life-saving and fire-fighting appliances.
单项选择题 （）should be saved first in an accident.
