Halon fire extinguishers are NOT effective when used on which types of fires?（）<br>A:Fires in electrical equipment<br>B:Flammable oils and greases<br>C:Class A fires in ordinary combustibles<br>D:Materials containing their own oxygen

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

出自：海船船员证

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