单项选择题
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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相关考题
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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 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 -
单项选择题
A galley grease fire on the stove may be extinguished using（）.
A.water
B.foam
C.the range hood extinguishing system
D.fire dampers
