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hole diameter : 35 phrases in 16 subjects |
| Aluminium industry | 1 |
| Astronautics | 2 |
| Automated equipment | 1 |
| Automobiles | 1 |
| Electronics | 1 |
| General | 1 |
| GOST | 1 |
| Mining | 4 |
| Oil / petroleum | 8 |
| Oil and gas | 1 |
| Oil and gas technology | 2 |
| Oilfields | 1 |
| Production | 1 |
| Technology | 5 |
| Transport | 3 |
| Wood processing | 2 |
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