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| frequenza vocale; frequenza fonica; frequenza telefonica | |||
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| frequenza in banda telefonica | |||
| fréquence vocale: 32 phrases in 7 subjects |
| Communications | 12 |
| Earth sciences | 1 |
| Electronics | 8 |
| Information technology | 8 |
| Measuring instruments | 1 |
| Microsoft | 1 |
| Telecommunications | 1 |