
Acoustics ? Determination of sound power levels of noise sources ? Guide lines for the use of basic standards and for the preparation of noise test codes
出版:Standardization Administration of China

專家解讀視頻
Acoustics ? Determination of sound power levels of noise sources ? Guide lines for the use of basic standards and for the preparation of noise test codes
出版:Standardization Administration of China
專家解讀視頻