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
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
Good housekeeping on a vessel prevents fires by（）.
Fire extinguishing agents used on Class C fires must be（）.
How is the external flotation bladder of an immersion suit inflated?（）
Fire extinguishers of sizes III，IV，and V are designated as（）.
Halon extinguishes a fire by（）.
Fusible-link fire dampers are operated by（）.
Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.
Fire fighting equipment requirements for a particular vessel may be found on the（）.
Halon extinguishers used on a class C fire should be directed at the（）.