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GB/T 4854.4-1999 standard english preview version PDF file download

GB Standard Code GB/T 4854.4-1999
Standard Category China National Standards
GB Standard English Title Acoustics--Reference zero for the calibration of audiometric equipment--Part 4:Reference levels for narrow-band masking noise
GB Standard Chinese Title 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
Chinese Version Price $15 USD per 50 pages
English Translation Price About $15  per 1 page; Inquire us for detail price

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