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| 煤矿内的危险气体; 碳化氢 | |||
| 甲烷 (CH₄) | |||
| 甲烷; 生物气 | |||
| 瓦斯井下煤层释放的沼气〈甲烷,CH₄〉和一定量空气混合之后，具有一定的爆炸性。这种混合气体叫做瓦斯或井下爆炸气体，参见 gas; 矿井瓦斯 | |||
| 沼气; 甲烷 (CH4) | |||
| 爆炸性沼气甲烷气 | |||
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| 沼气; 甲烷 | |||
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fire damp : 4 phrases in 3 subjects |
| Ecology | 1 |
| Electric machinery | 2 |
| Technology | 1 |
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