A large oil fire is best extinguished

1、Class B fires are best extinguished by

Class B fires are best extinguished by smothering, i-e（）.Adeprival of oxygenBremoval of heatCspraying of waterDinjecting of soda-acid

2、If a CO2 fire extinguisher is not read

If a CO2 fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?（）ADry chemicalBHalonCLow velocity fogDSteam

3、How does foam extinguish an oil fire?（

How does foam extinguish an oil fire?（）ABy cooling the oil below the ignition temperatureBBy removing the fuel source from the fireCBy excluding the oxygen from the fireDBy increasing the weight of the oil

4、Which extinguishing agent is best for

Which extinguishing agent is best for use on a magnesium fire?（）AWaterBSandCCO2DDry chemical

5、A large oil fire on the deck of a ship

A large oil fire on the deck of a ship can be fought most effectively with（）.Adry chemicalBfoamChigh-velocity fogDwater

6、Oil fires are best extinguished by（）.

Oil fires are best extinguished by（）.Acutting off the supply of oxygenBremoving the fuelCcooling below the ignition temperatureDspraying with water