 |
| |||
| система условных обозначений | |||
|
set of conventional set : 4 phrases in 3 subjects |
| Drilling | 1 |
| Mathematics | 2 |
| Oil / petroleum | 1 |
|
| |||
| система условных обозначений | |||
|
set of conventional set : 4 phrases in 3 subjects |
| Drilling | 1 |
| Mathematics | 2 |
| Oil / petroleum | 1 |