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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 air
B
has the greatest cooling ability
C
will leave no harmful residue
D
completely removes combustible vapors from the air
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单选题A class B fire is most successfully fought by（）.A
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单选题What is an advantage of using foam in fire fighting?（）A
It is effective in controlling fire in flowing oil such as coming from a broken fuel lineB
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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Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.A
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It is safe for personnelC
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单选题What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）A
WeightB
TemperatureC
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Cost
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单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）A
The agent is considered nontoxic at room temperature in low concentrationsB
The agent is less effective than carbon dioxideC
Halon primarily extinguishes the fire by coolingD
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单选题A branch line valve of a fire extinguishing system on a ship must be marked with the（）.A
maximum pressure allowed at that branchB
name of the space or spaces which it servesC
date of the last maintenance inspectionD
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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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sweep flames away with water sprayB
shut off the leakC
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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After extinguishing a fire with CO2，it is advisable to（）.A
use all CO2 available to cool the surrounding areaB
stand by with water or other agentsC
thoroughly ventilate the space of CO2D
jettison all burning materials
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单选题They were up very late because______.A
it was Sunday morningB
they were not very sleepyC
they were preparing for the dinnerD
they saw the great fire start
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