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| lowest-useful frequency (LUF; для ионосферной радиосвязи); lowest-useful high frequency (LUF; для ионосферной радиосвязи) | |||
| LUF | |||
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| lowest usable frequency | |||
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минимально применимая частота : 3 phrases in 1 subject |
| Mass media | 3 |
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