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

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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
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
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