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отношение диаметра : 23 phrases in 9 subjects |
| Antennas and waveguides | 1 |
| Electronics | 3 |
| Energy industry | 1 |
| General | 4 |
| Geometry | 1 |
| Jet engines | 2 |
| Nautical | 1 |
| Pipelines | 1 |
| Technology | 9 |
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