你可能感興趣的試題

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

單項(xiàng)選擇題

The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.

A.chemical ignition
B.spontaneous combustion
C.chemical combustion
D.radiation ignition