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单选题
Which extinguishing agent is effective in combating an isoprene fire?（）
A
Dry chemicals
B
CO2
C
Foam
D
All the above
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using the extinguishing agent to absorb the heat
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Class C, class D, and class E
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will remove all the toxic fumes from the airB
has the greatest cooling abilityC
will leave no harmful residueD
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单选题Which extinguishing agent is best for use on a magnesium fire?（）A
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SandC
CO2D
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FoamB
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单选题As an extinguishing agent，foam（）.A
conducts electricityB
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多选题On what conditions may an exemption certificate，exempting from the requirement to install a fixed fire extinguishing system in a cargo space，be issued？（）AThe ship is constructed and solely intended for carriage of ore， coal， grain， unseasoned timber， non-combustible cargoes or cargoes which according to the Administration constitute a low fire riskBSteel hatch covers and effective means of closing all ventilators and other openings to the cargo space are fittedCA fixed deck foam system is be fitted in lieu of the cargo space extinguishing systemDThe vessel is less than 10 000 gross tonnage
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单选题An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.A
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单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.A
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单选题Foam is a very effective smothering agent and（）.A
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can be used to combat combustible metal firesD
All of the above
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