...要性 » Rural land ownership is indeed entitled to the necessity of the work 吸声系数 » The sound absorption coefficient 新世纪广场 » The New Century Plaza ..
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The sound absorption coefficient of the material was tested by standing wave tube method.
采用驻波管法测试材料的吸声系数。
Methods Use a standing wave tube to measure the sound absorption coefficient of many kinds of grain.
采用驻波管法测量了多种粮食的吸声系数。
Porosity, surface density, thickness, flow resistance, structure factor and other factors affect the sound absorption coefficient.
孔隙率，面密度，厚度，流阻，结构因数因素综合影响其吸声系数。
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