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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热门试题

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