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| audio; di bassa frequenza | |||
| a bassa frequenza | |||
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низкочастотный : 34 phrases in 7 subjects |
| Antennas and waveguides | 1 |
| Communications | 1 |
| Electrical engineering | 1 |
| Metallurgy | 2 |
| Military | 11 |
| Radio | 5 |
| Technology | 13 |
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