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| 51. | Ringrose pocket methanometer |
| 里因罗斯袖珍沼气检定仪 |
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| 52. | after-damp n.[U]poisonous mixture of gases after the explosion of firedamp in a coal-mine |
| （煤矿沼气）爆炸后的毒气. |
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| 53. | International Symposium on Coal Bed Methane |
| 国际煤床沼气专题讨论会 |
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| 54. | They use some for making grain and some finds its way to the roots and then into the soil, where the bacteria can use it to produce methane. |
| 其中一部分用来制造稻米，一些通过根，流失到土壤里，然后细菌利用这些炭产生沼气。 |
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| 55. | Pilot Solar Energy and Biogas Demonstration Unit |
| 太阳能和沼气示范实验单位 |
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| 56. | Standard on design of biogas pipelines for peasant household |
| GB/T7636-1987农村家用沼气管路设计规范 |
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| 57. | Depending on the waste feedstock and the system design, biogas is typically 55% to 75% pure methane. |
| 视垃圾原料和系统设计而定，沼气通常含有55%至75%的纯沼气。 |
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| 58. | Those mines have the highest concentration of methane gas. |
| 那些矿井全都充满着高密度的沼气 |
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| 59. | Methane is the second most important greenhouse gas after carbon dioxide, and rice fields are among the biggest sources of methane. |
| 沼气是仅次于二氧化碳的第2重要的温室气体，稻田是沼气的最大来源。 |
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| 60. | You obviously don't know anything about methane deposits. |
| 你不是也不知道这有沼气聚集吗. |
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