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NBN-EN 21680-1-1992 2500 《声音 测量电动旋转机发出响声的实验规则 第1部分:在开阔空间里反射面上实施的鉴定方法》.pdf
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NBNEN21680119922500
声音
测量
电动
旋转
发出
响声
实验
规则
部分
开阔
空间
反射
面上
实施
鉴定
方法
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