Halon extinguishers used on a class C

1、After using a Halon extinguisher，it sh

After using a Halon extinguisher，it should be（）.Aput back in service if more than 50% of the charge remainsBrepaintedCdiscardedDrecharged

2、Any extinguishing agent used on a Clas

Any extinguishing agent used on a Class “C” fire must have which important property? （）ACooling abilityBLeaves no residueCPenetrating powerDNonconductivity

3、Halon fire extinguishers are NOT effec

Halon fire extinguishers are NOT effective when used on which types of fires?（）AFires in electrical equipmentBFlammable oils and greasesCClass A fires in ordinary combustiblesDMaterials containing their own oxyge

4、Halon extinguishes a fire by（）.

Halon extinguishes a fire by（）.Abreaking the chain reactionBsmothering the fireCcooling the fireDcoating the fuel with a nonflammable surface

5、Halon from extinguishers used on a cla

Halon from extinguishers used on a class B fire，should be directed（）.Aat the top of the flamesBat the base of the fire near the edgeCin short quick burstsDtoward the upwind side of the fire

6、Class C fires are best extinguished by

Class C fires are best extinguished by （）.Afoam extinguishersBwater spray equipmentCdry powder extinguishersDsoda-acid extinguisher