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| 压电式微音器; 压电式传声器; 压电传声器; 晶体传声器 | |||
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| 晶体话筒 | |||
| 压电传声器 | |||
| 压电式微音器; 压电式传声器; 晶体传声器 | |||
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piezoelectrical microphone : 4 phrases in 1 subject |
| Technology | 4 |
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