单项选择题
To lubricate the swivel or remove corrosion from a fire hose coupling，you should use（）.
A.glycerine B.graphite C.kerosene D.fresh water and soap
单项选择题 To determine if a CO2 fire extinguisher is fully charged，you would（）.
单项选择题 There is a fire in the crew’s quarters of your vessel. You should（）.
单项选择题 There is a fire aft aboard your vessel. To help fight the fire，you should（）.
