單項(xiàng)選擇題Halon fire extinguishers are NOT effective when used on which types of fires?（）

A.Fires in electrical equipment
B.Flammable oils and greases
C.Class A fires in ordinary combustibles
D.Materials containing their own oxygen


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1.單項(xiàng)選擇題Halon extinguishes fire primarily by（）.

A.cooling
B.smothering
C.shielding of radiant heat
D.breaking the chain reaction

2.單項(xiàng)選擇題Halon extinguishes a fire by（）.

A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fuel with a nonflammable surface

3.單項(xiàng)選擇題Halon extinguishers used on a class C fire should be directed at the（）.

A.base of the equipment
B.top of the equipment
C.power source
D.source of the fire

4.單項(xiàng)選擇題Good housekeeping on a vessel prevents fires by（）.

A.allowing better access in an emergency
B.eliminating potential fuel sources
C.eliminating trip hazards
D.improving personnel qualifications

5.單項(xiàng)選擇題Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.

A.sweep flames away with water spray
B.shut off the leak
C.use a chemical foam fire extinguisher
D.call the local fire department