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| ζώνη συχνοτήτων; ζώνη συχνότητας | |||
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| ζώνη συχνοτήτων | |||
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banda de frequência : 61 phrases in 4 subjects |
| Communications | 18 |
| Earth sciences | 1 |
| Electronics | 37 |
| Information technology | 5 |
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