单项选择题
A.Life jackets B.Survival at Sea manual C.lifeboat D.torch
Water is a very effective fire extinguishing agent beca...
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
A large oil fire is best extinguished with（）A.soda acid...
单项选择题A large oil fire is best extinguished with（）
A.soda acid B.foam C.CO2 D.sand
Fires in escaping flammable gas are quickly brought und...
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
