单项选择题
The blocking or absence of fire dampers can cause（）.
A.the accumulation of explosive gases
B.faster cooling of the fire
C.the fire to spread through the ventilation system
D.fixed foam systems to be ineffective
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The bilge pump on a fishing vessel（）.
A.must be fixed if the vessel exceeds 12 meters in length
B.may be used as a fire pump
C.must be portable if there are more than 4 watertight compartments
D.must be capable of pumping at least 450 gpm -
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The best method of extinguishing a class A fire is to（）.
A.remove oxygen from the area
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A.spray directly on the base of the fire
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C.sweep the fire with the foam
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