单选题On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.Amimimum oxygen content lineBcritical displacement lineCcritical dilution lineDupper threshold limit
单选题
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
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