單項(xiàng)選擇題

A flame screen（）.

A.permit the passage of vapor but not of flame
B.prevents the passage of flammable vapors
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

A foam-type portable fire extinguisher would be most useful in combating a fire in（）.

A.soild 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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A flame screen（）.

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A foam-type portable fire extinguisher is most useful in fighting a fire in（）.

A foam-type portable fire extinguisher would be most useful in combating a fire in（）.