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| return sludge (ил для прививки свежей сточной жидкости) | |||
| возвратный ил: 17 phrases in 9 subjects |
| Construction | 3 |
| Ecology | 5 |
| General | 1 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 1 |
| Sewage and wastewater treatment | 2 |
| Technology | 2 |
| Water resources | 1 |
| Water supply | 1 |