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| 发音器; 音频振荡器〔发生器,发电机〕 | |||
| 声音发生器 | |||
| 音频振荡器; 音频发生器 | |||
| 音调发生器; 信号音发生器 | |||
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tone generator : 14 phrases in 4 subjects |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 9 |
| Technology | 3 |
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