單項(xiàng)選擇題

A.shutting off the air supply
B.cooling the fule to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition

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A.solid materials such as wood or bales of fiber
B.inflammable liquids
C.electrical equipment
D.metallic solids

A.only when there is positive stability
B.only when there is negative stability
C.only when there is neutral stability
D.at all times