Code of China Chinese Standard Classification Professional Classification ICS Classification Latest
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Position: Search valid to be valid superseded to be superseded abolished to be abolished
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GB/T 4854.1-1999 Acoustics--Reference zero for the calibration of audiometric equipment--Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones 150.0 via email in 1~3 business day abolished
JJG 2017-2005 Verification Scheme of Measuring Instruments for Underwater Sound Pressure 120.0 via email in 1~3 business day valid
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