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Foam is a very effective smothering agent and ______.
A.it provides cooling as a secondary effect
B.works well on extinguishing electrical fires
C.can be used to combat combustible metal fires
D.All of the above
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单选题What is an advantage of using foam in fire fighting?（）A
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单选题Which statement about firefighting foam is TRUE?（）A
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单选题Water is a very effective fire extinguishing agent because it（）A
will remove all the toxic fumes from the airB
has the greatest cooling abilityC
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completely removes combustible vapors from the air
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单选题As an extinguishing agent，foam（）.A
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单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）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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单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.A
cannot be made with salt waterB
is heavierthan oil and sinks below its surfaceC
is corrosive and to fire fightersD
conducts electricity
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单选题Blocking open or removing fire dampers can cause（）.A
fixed foam systems to be ineffectiveB
faster cooling of the fireC
the accumulation of explosive gasesD
the fire to spread through the ventilation system
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单选题Which extinguishing agent is most effective on a mattress fire?（）A
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单选题Foam is a very effective smothering agent and（）.A
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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单选题Firefighting foam is only effective when the foam（）.A
penetrates to the bottom of the fireB
is kept saturated with low-velocity water fogC
mixes with the burning fuel oilD
completely covers the top of the burning liquid
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