On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.
- Aminimum oxygen content line
- Bcritical displacement line
- Ccritical dilution line
- Dupper threshold limit
问题
On a hydrocarbon flammability chart th
参考解析：
分类：燃烧与爆炸题库
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