CART (Up to 12 items/PDFs). How to add more items? Search 'GB/T 1.1' --> Add to Cart | Delete | 1 | GB/T 4854.7-2008_ENGLISH | Acoustics -- Reference zero for the calibration of audiometric equipment -- Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions | 1 | 0, How it works in 9s? | 170 | 99+ currencies | PDF1 | More PDF Samples Total (USD) | 170.00 |
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