單項(xiàng)選擇題A fire of escaping liquefied flammable gas is best extinguished by().

A.cooling the gas below the ignition point
B.cutting off the supply of oxygen
C.stopping the flow of gas
D.interrupting the chain reaction


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1.單項(xiàng)選擇題A chemical additive to LPG gives it a characteristic().

A.odor
B.color
C.pressure
D.density

2.單項(xiàng)選擇題On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen,lying tangent to the flammability range,is called the().

A.mimimum oxygen content line
B.critical displacement line
C.critical dilution line
D.upper threshold limit