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| fréquence audible | |||
| fréquence musicale | |||
| fréquence vocale | |||
| тональная частота: 15 phrases in 6 subjects |
| Automated equipment | 6 |
| Communications | 1 |
| Computers | 2 |
| Medical appliances | 4 |
| Radio | 1 |
| Technology | 1 |
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