单项选择题
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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相关考题
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单项选择题
A large oil fire is best extinguished with（）
A.soda acid
B.foam
C.CO2
D.sand -
单项选择题
Fires in escaping flammable gas are quickly brought under control by（）
A.stopping the flow of gas
B.reducing the chemical chain reaction
C.increasing the oxygen supply
D.cooling below the autoignition point -
单项选择题
If a fire occurs in the boiler room because of a leaking fuel line to a burner, you shut off the fuel using the（）
A.burner valve
B.root valve
C.quick closing valve
D.oil return valve
