A.should be worn while fighting a fire
B.can be used in atmospheres deficient in oxygen
C.filter contaminants from air that is to be breathed
D.may be substituted for a self-contained breathing apparatus
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A.8the heat of a fire melting the link
B.a break-glass and pull-cable system
C.electrical controls on the bridge
D.a mechanical arm outside the vent duct
A.solid materials such as wood or bales of fiber
B.inflammable liquids
C.electrical equipment
D.metallic solids
A.it provides cooling as a secondary effect
B.works well on extinguishing electrical fires
C.can be used to combat combustible metal fires
D.All of the above
A.cooling
B.chemical action
C.smothering
D.inerting the air
A.smothering the burning material
B.chemical combination with burning material
C.absorbing the burning material
D.organic destruction of the burning material
最新試題
Good housekeeping on a vessel prevents fires by（）.
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
Fire may be spread by which means?（）.
Halon extinguishes fire primarily by（）.
Halon extinguishes a fire by（）.
Fire extinguishing agents used on Class C fires must be（）.
Fire extinguishers of sizes III，IV，and V are designated as（）.
Fire extinguishers on inspected vessels are numbered by size I through V，with I being（）.
Halon from extinguishers used on a class B fire，should be directed（）.
CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.