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| поверхностное трение | |||
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surface frequency : 18 phrases in 8 subjects |
| Astronautics | 1 |
| Astronomy | 2 |
| Aviation | 1 |
| High frequency electronics | 2 |
| Makarov | 3 |
| Mathematics | 2 |
| Military | 6 |
| Security systems | 1 |
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