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| 21. | perceived noise level |
| 感觉噪声级 |
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| 22. | equivalent noise pressure |
| 等效噪声压 |
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| 23. | flow noise spectrum |
| 流动噪声谱 |
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| 24. | signal-to-noise characteristic |
| 信噪特征 |
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| 25. | noise limited receiver |
| 静噪接收机 |
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| 26. | reference noise source |
| 标准噪声源 |
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| 27. | Total Noise Level |
| 总噪声级 |
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| 28. | noise immunization |
| 消噪抗扰 |
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| 29. | white-noise level |
| 白噪声级 |
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| 30. | frequency division of noise |
| 噪声频程 |
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