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| 31. | methane power station |
| 沼气电站 |
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| 32. | methane determinatio |
| 沼气测定 |
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| 33. | semiconductor methane alarm |
| 半导体沼气警报器 |
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| 34. | very gassy mine |
| 超级沼气矿 |
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| 35. | infrared methanometer |
| 红外线沼气测定仪 |
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| 36. | methane drainage borehole |
| 沼气排气钻孔 |
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| 37. | The Biogas Technology in China |
| 中国沼气技术 |
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| 38. | occluded methane |
| 吸留沼气 |
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| 39. | methane air mixture |
| 沼气空气混合物 |
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| 40. | microorganisms of biogas fermentation |
| 沼气发酵微生物 |
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