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单选题
As compared to carbon dioxide，dry chemical has which advantage?（）.
A
Cleaner
B
Effective on metal fires
C
Greater range
D
More cooling effect
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单选题As compared to carbon dioxide,dry chemical has which advantage?（）.A
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It is safe for personnelC
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单选题Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）A
Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiationB
Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gasC
Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gasD
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in all battery storage locationsC
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will right itself when the canopy tubes inflateD
must be cleared of the buoyant equipment before it will right itself
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