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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 4854.4-1999 |
Acoustics--Reference zero for the calibration of audiometric equipment--Part 4:Reference levels for narrow-band masking noise 声学 校准测听设备的基准零级 第4部分:窄带掩蔽噪声的基准级 |
China National Standards 4:Reference |
 English PDF |
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