A.odor
B.color
C.pressure
D.density
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A.mimimum oxygen content line
B.critical displacement line
C.critical dilution line
D.upper threshold limit
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The vapor pressure of a substance（）.
What normally helps in detecting escaping gas? （）
What will NOT increase friction of a liquid flowing in a pipe and cause a loss of suction head?（）.
Butadiene，inhibited，is labeled as a（）.
LFG tank and pipeline maintenance should include（）.
The amount of LFG that may be loaded into a given tank is determined by（）.
It should be noted（）the use of synthetic mooring ropes able to produce sparks by their manipulation is absolutely forbidden on board petroleum tankers and LPG or LNG carriers，or any vessels carrying inflammable substances.
To determine the pressure and temperature limitations under which LFG is required to be transported on a barge，you should look at the（）.
Combustible gas indicators operate by drawing an air sample into the instrument（）.
What is used to test a tank for oxygen content?（）