单选题When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.Aair from contacting the oil vaporsBpermitting re-ignition boiling of the heated oilCspontaneous combustion below the oil surfaceDtoxic fumes from escaping to the surface
单选题
When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.
A
air from contacting the oil vapors
B
permitting re-ignition boiling of the heated oil
C
spontaneous combustion below the oil surface
D
toxic fumes from escaping to the surface
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