 |
| |||
| biologische Reiniger (сточных вод); biologische Reinigung (Selbstreinigung) | |||
| biologische Reinigung (сточных вод) | |||
| biologische Klärung; biologische Behandlung; biologisches Verfahren | |||
| biologische Reinigung | |||
| биологическая очистка: 22 phrases in 8 subjects |
| Construction | 13 |
| Environment | 2 |
| Hygiene | 2 |
| Medical | 1 |
| Natural resourses and wildlife conservation | 1 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 1 |
| Water supply | 1 |