 |
| |||
| gaz souterrain | |||
| gaz naturel | |||
| φυσικό αέριο: 21 phrases in 6 subjects |
| Accounting | 1 |
| Chemistry | 3 |
| Coal | 1 |
| Energy industry | 10 |
| Environment | 2 |
| General | 4 |
|
| |||
| gaz souterrain | |||
| gaz naturel | |||
| φυσικό αέριο: 21 phrases in 6 subjects |
| Accounting | 1 |
| Chemistry | 3 |
| Coal | 1 |
| Energy industry | 10 |
| Environment | 2 |
| General | 4 |