 |
| fixed gas: 12 phrases in 9 subjects |
| Drilling | 1 |
| Ecology | 2 |
| Energy system | 1 |
| General | 1 |
| Makarov | 1 |
| Metallurgy | 1 |
| Public utilities | 1 |
| Technology | 3 |
| Thermal engineering | 1 |
|
| fixed gas: 12 phrases in 9 subjects |
| Drilling | 1 |
| Ecology | 2 |
| Energy system | 1 |
| General | 1 |
| Makarov | 1 |
| Metallurgy | 1 |
| Public utilities | 1 |
| Technology | 3 |
| Thermal engineering | 1 |