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| 声音频率; 特低频 | |||
| 声频; 音频 | |||
| 声频音频 | |||
| 话音频率; 话频 | |||
| 语音频率; 通话频率 | |||
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| 话〔音，声〕频; 口声频率 | |||
| 音频 | |||
| voice frequency: 95 phrases in 12 subjects |
| Air defense | 2 |
| Automobiles | 1 |
| Aviation | 8 |
| Communications | 5 |
| Earth sciences | 1 |
| Electronics | 35 |
| General | 3 |
| Information technology | 7 |
| Rail transport | 3 |
| Space | 3 |
| Technology | 12 |
| Telecommunications | 15 |
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