Biochemical Oxygen demand: 31 phrases in 11 subjects |
Biotechnology | 1 |
Ecology | 7 |
Energy industry | 1 |
Figure of speech | 1 |
Hydraulic engineering | 2 |
Makarov | 2 |
Natural resourses and wildlife conservation | 3 |
Oil / petroleum | 10 |
Oil and gas | 2 |
Technology | 1 |
Water supply | 1 |