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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单选题A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.Ausing a 2-1/2 inch hoseBthere is an outlet for the smoke and heatCthe fire is totally contained by the ship's structureDat least two fog streams can be used
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单选题When inspecting a tank barge to see that it has all the required fire extinguishers and other safety items aboard，which of the following is the best source for determining what is required? （）AThe supervisor in charge of the dock to which the barge is tied upBPart 38 of the Rules and Regulations for Tank VesselsCThe Certificate of Inspection of the bargeDThe local fire marshal
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