單項(xiàng)選擇題Nylon line can be dangerous because it（）.
A.breaks down when wet
B.kinks be discharged
C.is not elastic
D.stretches
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1.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
2.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
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