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| 31. | microorganisms of biogas fermentation |
| 沼气发酵微生物 |
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| 32. | The Biogas Technology in China |
| 中国沼气技术 |
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| 33. | methane air mixture |
| 沼气空气混合物 |
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| 34. | explosive range of methan |
| 沼气爆炸范围 |
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| 35. | methane drainage borehole |
| 沼气排气钻孔 |
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| 36. | very gassy mine |
| 超级沼气矿 |
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| 37. | semiconductor methane alarm |
| 半导体沼气警报器 |
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| 38. | methan explosive proportion |
| 沼气爆炸量 |
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| 39. | occluded methane |
| 吸留沼气 |
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| 40. | fire damp detector |
| 沼气检定器 |
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