單項(xiàng)選擇題0f all the extinguishing agents listed below, which one has the greatest capacity for heat adsorption?（）.
A.Water fog
B.Carbon dioxide
C.Dry chemical
D.Solid stream of water
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1.單項(xiàng)選擇題0il fires are best extinguish by（）.
A.cutting off supply of oxygen
B.removing the fuel
C.cooling below the ignition temperature
D.spraying with water
2.單項(xiàng)選擇題0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.
A.vertical position
B.horizontal position
C.boom stop angle
D.minimum radius angle
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What is it called when it is possible to ignite the vapour above the oil?（）
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