销售一部0316-55801970316-32898201351326076615350695870刘先生销售电话0316-519926615612629577王女士传真0316-5580197网站邮箱278054976@******278054976河北大城县电梯井吸音板河北电梯井吸音板厂家★吸声检测表频率HZ10012516020025031540050063080010001250160020002500315040005000aNRC吸声系数a0.100.100.120.340.370.510.630.730.880.950.960.980.980.960.980.950.880.870.680.75注：1.A为100-5000HZ平均吸声系数。2.NRC为降噪系数，是250、500、1000、2000HZ的4个倍频带系数的算术平均值)