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| primary treatment Removal of floating solids and suspended solids, both fine and coarse, from raw sewage (粗糙的、浮动的固体和暂时的固体去除。) | |||
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初级处理 : 19 phrases in 5 subjects |
| Engineering geology | 1 |
| Environment | 2 |
| Oil / petroleum | 2 |
| Technology | 12 |
| Water resources | 2 |
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