Acoustics—Reference zero for the calibration of audiometric equipment—Part 9:Preferred test conditions for the determination of reference hearing threshold levels
IDT ISO 389-9: 2009
全国声学标准化技术委员会(SAC/TC 17)
GB/T 4854的本部分规定了为建立基准听阈级标准值而确定受试者听阈的测试条件。
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