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| audio frequence; frequency of a sound | |||
| audiofrequency | |||
| audio frequency | |||
| audiofrequenza: 114 phrases in 9 subjects |
| Communications | 39 |
| Earth sciences | 4 |
| Electronics | 34 |
| Industry | 1 |
| Information technology | 29 |
| Measuring instruments | 2 |
| Physics | 1 |
| Radio | 2 |
| Sound recording | 2 |