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| тональная частота | |||
| звуковая частота | |||
| fréquence audible: 13 phrases in 6 subjects |
| Automated equipment | 1 |
| Aviation | 2 |
| Information technology | 2 |
| Natural resourses and wildlife conservation | 1 |
| Physics | 1 |
| Radio | 6 |
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