China Acoustics—Reference GB Standards Search Result

and Chinese version GB Standards, you can purchase directly in the web page; After receive your payment, we will send the GB Standards PDF file to your Email within 1~3 days.
2. Other English version GB Standards are not ready translated, only after get your order, then we translate them, time usually need 3-5 days .


	GB/T 4854.3-2022 Acoustics—Reference zero for the calibration of audiometric equipment—Part 3：Reference equivalent threshold vibratory force levels for pure tones and bone vibrators - 英文版
	GB/T 4854.9-2016 Acoustics—Reference zero for the calibration of audiometric equipment—Part 9: Preferred test conditions for the determination of reference hearing threshold levels - 英文版

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