Acoustics - measurement of insertion loss of ducted silencers without flow - laboratory survey method 声学.无气流管道消声器插入的损耗测量.实验室调查法
2.
Acoustics - determination of insertion loss of ducted silencers without flow - laboratory survey method iso 11691 : 1995 ; german version en iso 11691 : 1995 声学.无气流管道消声器插入损失测量.实验室测量法