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плоская труба : 10 phrases in 8 subjects |
| Aerohydrodynamics | 2 |
| Automobiles | 1 |
| Construction | 1 |
| Military | 1 |
| Oil and gas technology | 1 |
| Pipelines | 1 |
| Road works | 1 |
| Thermal engineering | 2 |
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