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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A.odor
B.color
C.pressure
D.density
A.mimimum oxygen content line
B.critical displacement line
C.critical dilution line
D.upper threshold limit
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LFG tank and pipeline maintenance should include（）.
Upon release to the atmosphere，LFG readily（）.
Each inert gas system must be designed to supply the cargo tanks with a gas，or mixture of gasses，that has an oxygen content by volume of（）.
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Gasoline vapor tends to collect（）.