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| ionospheric propagation | |||
| ionospheric propagation (радиоволн) | |||
| ионосферное распространение: 20 phrases in 6 subjects |
| Computers | 1 |
| Electronics | 10 |
| Makarov | 1 |
| Mass media | 4 |
| Military | 2 |
| Radio | 2 |
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