The explosive mixture of firedamp and air.
'甲烷'。''和空气的爆炸混合物。
Can burn, vapor and air to form an explosive mixture, the explosion limit of 7%-73% (volume).
能燃烧，蒸气与空气形成爆炸性混合物，爆炸极限7% - 73%(体积)。
For the dangerous sites with explosive air mixture: 2 division.
爆炸性气体混合物危险场所：2区。
For the dangerous sites with explosive dust mixture: 11 division.
爆炸性粉尘混合物危险场所：11区。
For the dangerous sites with explosive dust mixture: 11 division.
爆炸性粉尘混合物危险场所：11区。
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