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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
carbon dioxide
B
Halon 1301
C
dry chemical
D
water fog
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单选题Which is a disadvantage of Halon as a fire extinguishing medium?（）A
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单选题For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.A
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单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）A
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Carbon dioxide should be applied slowly to a large engine room fireC
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Its smothering effect is excellent for class B fires
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单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.A
cannot be made with salt waterB
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is corrosive and to fire fightersD
conducts electricity
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it provides cooling as a secondary effectB
works well on extinguishing electrical firesC
can be used to combat combustible metal firesD
All of the above
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