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working surface : 23 phrases in 15 subjects |
| Astronomy | 1 |
| Automated equipment | 1 |
| Construction | 2 |
| Geophysics | 1 |
| Gold mining | 1 |
| Makarov | 1 |
| Mechanics | 1 |
| Metallurgy | 2 |
| Non-destructive testing | 2 |
| Oil / petroleum | 2 |
| Oil and gas technology | 2 |
| Oilfields | 2 |
| Silicate industry | 1 |
| Space | 1 |
| Technology | 3 |