очистка сточных вод: 48 phrases in 11 subjects |
Chemistry | 7 |
Construction | 8 |
Environment | 1 |
Food industry | 2 |
Forestry | 1 |
Hygiene | 1 |
Natural resourses and wildlife conservation | 21 |
Technology | 2 |
Textile industry | 2 |
United Nations | 1 |
Waste management | 2 |