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GB/T 4854.4-1999

Chinese Standard: 'GB/T 4854.4-1999'
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)See DetailStatusRelated Standard
GB/T 4854.4-1999English120 Add to Cart 0-9 seconds. Auto delivery. Acoustics. Reference zero for the calibration of audiometric equipment. Part 4: Reference levels for narrow-band masking noise GB/T 4854.4-1999 GB/T 4854.4-1999

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