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| espectro de frecuencia | |||
| espectro de frecuencias | |||
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| espectro en frecuencias en telecomunicación | |||
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frequency spectrum : 25 phrases in 7 subjects |
| Communications | 15 |
| Earth sciences | 1 |
| Electronics | 4 |
| Information technology | 1 |
| Natural sciences | 2 |
| Radio | 1 |
| Satellite communications | 1 |