Fires involving combustible metals are

1、When two different metals are joined t

When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions （） which can be used to measure temperature.Aa current will flowBa power will developCa heat will flowDa pressure will produce

2、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

3、Please let us know what（）are involved

Please let us know what（）are involved and the time（）for delivery.Aformalities，takenBprocedures，needCbusiness，takenDprocess，needed

4、The cross-head shoes are white metal l

The cross-head shoes are white metal lined, grooves being cut horizontally on the face of the white metal to ensure （）.Aan adequate supply of lube oilBan adequate supply of fuel oilCan adequate supply of turbine oilDan adequate supply of cylinder oil

5、Please let us know what（）are involved

Please let us know what（）are involved and the time（）for delivery.Aformalities，takenBprocedures，needCbusiness，takenDprocess，needed

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