单项选择题
The three basic elements necessary for any fire are （）.
A.heat, gas, and flames
B.fuel, heat, and oxygen
C.heat, nitrogen, and fuel
D.fuel oil, nitrogen, and oxygen
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A.6 hours
B.12 hours
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If a fire occurs in the boiler room as a result of a leaking fuel line, you should FIRST （）.
A.notify the engineer on watch
B.isolate and secure the piping
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单项选择题
The four basic components of a fire are chain reaction, heat, fuel, and （）.
A.carbon monoxide
B.oxygen
C.carbon dioxide
D.any gaseous substance
