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	GB/T 21228.1-2007 Acoustics - Sound-scattering properties of surfaces - Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room 声学表面声散射特性第1部分：混响室中无规入射声散射系数测量 - 英文版
	GB/T 17312-1998 Random-incidence and diffuse-field calibration of sound level meters 声级计的无规入射和扩散场校准 - 英文版

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