| |||
| обходные трубные пути (BoD OPL) | |||
|
pipe loop : 20 phrases in 12 subjects |
| Chemistry | 1 |
| Construction | 1 |
| Drilling | 1 |
| Electronics | 1 |
| Energy industry | 2 |
| Mechanic engineering | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Oil and gas | 2 |
| Oil and gas technology | 1 |
| Thermal engineering | 5 |
| Transport | 1 |