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| 41. | A combustible gas, chiefly methane, occurring naturally in mines from the decomposition of coal. |
| 沼气一种在矿坑里由煤腐烂而自然产生的可燃气体，主要成分是甲烷 |
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| 42. | MSA methanometer |
| MSA 型沼气检定仪 |
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| 43. | lower flammability limit of methane |
| 沼气成分燃烧下限 |
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| 44. | interference methanometer |
| 干扰式沼气检定仪 |
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| 45. | Biogas plant |
| 生物气体工厂;沼气厂 |
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| 46. | Biogas furnace of family |
| GB/T3606-1983家用沼气灶 |
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| 47. | Hirschback method |
| 上部平巷排放沼气法 |
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| 48. | burrel gas detector |
| 少量沼气检定器 |
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| 49. | Landfill gas and liquid leach ate, which are the products of natural decay of organic wastes, are continuously released and cause considerable impact on the environment. |
| 有机废物自然分解时不断释出沼气及产生渗滤污水，对环境造成严重影响。 |
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| 50. | Must be some kind of methane buildup. |
| 应该是沼气集聚起来了. |
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