单项选择题
A.batten down the engine room B.start the fire pump C.apply carbon dioxide to the fire D.shut off the fuel supply
A foam-type portable fire extinguisher would be most us...
单项选择题A foam-type portable fire extinguisher would be most useful in combating a fire in（）.
A.solid materials such as wood or bales of fiber B.flammable liquids C.a piece of electrical equipment D.combustible metallic solids
A foam-type portable fire extinguisher is most useful i...
单项选择题A foam-type portable fire extinguisher is most useful in fighting a fire in（）.
A.generators B.oil drums C.the bridge controls D.combustible metals
A fixed CO2 system on a ship with a capacity of over 30...
单项选择题A fixed CO2 system on a ship with a capacity of over 300 lbs (136 kilograms) CO2 which protects spaces other than tanks must have（）.
A.two or more releasing stations B.automatic release in event of a fire C.an audible alarm and time delay D.an audible and visible alarm
