单项选择题
A.solid materials such as wood or bales of fiber
B.flammable liquids
C.a piece of electrical equipment
D.combustible metallic solids
单项选择题 A foam-type portable fire extinguisher is most useful in fighting a fire in（）.
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（）.
单项选择题 A fire starts on your vessel while refueling. You should FIRST（）.