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| ложное дно; звукорассеивающий слой | |||
| deep scattering: 13 phrases in 7 subjects |
| Acoustics | 1 |
| Ecology | 1 |
| Hydrology | 2 |
| Makarov | 3 |
| Nautical | 2 |
| Navigation | 2 |
| Technology | 2 |
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