单选题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 oxygen
单选题
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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