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| convergence zone (точки минимальных потерь передачи в подводном звуковом канале) | |||
| focusing area | |||
| focus area | |||
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зона фокусировки : 9 phrases in 5 subjects |
| Advertising | 1 |
| Geophysics | 1 |
| Mass media | 5 |
| Quantum electronics | 1 |
| Sakhalin | 1 |
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