 |
| |||
| пласт средней мощности; слой средней мощности | |||
| medium bed: 6 phrases in 5 subjects |
| Ecology | 2 |
| Energy industry | 1 |
| Gas processing plants | 1 |
| Technology | 1 |
| Water supply | 1 |
|
| |||
| пласт средней мощности; слой средней мощности | |||
| medium bed: 6 phrases in 5 subjects |
| Ecology | 2 |
| Energy industry | 1 |
| Gas processing plants | 1 |
| Technology | 1 |
| Water supply | 1 |