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| 51. | sewage analysis |
| 污水分析 |
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| 52. | effluent sewage |
| 废污水 |
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| 53. | clarified sewage |
| 澄清的污水 |
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| 54. | sewage effluent |
| 污水排水口 |
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| 55. | combined sewage |
| 混合污水,合流污水 |
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| 56. | sewage aeration |
| 污水曝气 |
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| 57. | activated sewage |
| 活性污水 |
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| 58. | sewage biolysis |
| 污水生物分解 |
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| 59. | household sewage |
| 住宅排水 |
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| 60. | sewage utilization |
| 污水利用 |
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