單項選擇題

A combustible gas indicator meter is calibrated to read the percentage of（）.

A.vapor to oxygen
B.the flammable limit concentration
C.the autoignition concentration
D.the lower explosive limit concentration

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單項選擇題

A class C fire would be burning（）.

A.fuel oil
B.wood
C.celluloid
D.electrical insulation

單項選擇題

A class B fire is most successfully fought by（）.

A.preventing oxygen from reaching the burning material
B.cooling the burning material below its ignition temperature
C.using the extinguishing agent to make the burning material fire-resistant
D.using the extinguishing agent to absorb the heat