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| 声学本底噪声级; 无线电干扰电平 | |||
| 背景噪声级 | |||
| 背景噪声电平 | |||
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| 本底噪声电平 | |||
| 背景噪声水平; 背景噪声电平 | |||
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background-noise level : 1 phrase in 1 subject |
| Technology | 1 |
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