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| 碳粉传声器扩音器 | |||
| 碳粒传声器 | |||
| 炭粒传声器 | |||
| 碳粒话筒 | |||
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carbon microphone : 9 phrases in 4 subjects |
| Construction | 1 |
| Electronics | 3 |
| Shipbuilding | 1 |
| Technology | 4 |
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