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
Fire hose couplings（）.
Foam extinguishes a fire by（）.
Foam is a very effective smothering agent and（）.
How does foam extinguish an oil fire?（）.
Halon extinguishers used on a class C fire should be directed at the（）.
Fire fighting equipment requirements for a particular vessel may be found on the（）.
Fire hose should be washed with（）.
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
Fire extinguishing agents used on Class C fires must be（）.
Except in rare cases，it is impossible to extinguish a shipboard fire by（）.