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переменная частота : 24 phrases in 11 subjects |
| Astronautics | 1 |
| Aviation | 8 |
| Computers | 2 |
| Construction | 1 |
| Electronics | 1 |
| General | 1 |
| Mechanic engineering | 1 |
| Medical | 2 |
| Metallurgy | 1 |
| Radio | 5 |
| Technology | 1 |
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