free acoustics 中文意思是什麼
free acoustics
解釋
室外聲學-
Acoustics - test code for the determination of acoustical characteristics of sound barriers installed in a free field
聲學.無聲波場中安裝的隔音設備的聲學特性測定用試驗規程 -
Acoustics. determination of sound power levels of noise sources using sound prssure. engineering method in an essentially free field over a reflecting plane
聲學.使用聲壓法對噪聲源聲強級的測定.反射平面上基本無聲波場的工程測試法 -
Acoustics - determination of sound power levels of noise sources using sound pressure - engineering method in an essential free field over a reflecting plane iso 3744 : 1994 ; german version en iso 3744 : 1995
聲學.使用聲壓的噪聲源聲音強度級的測定.在一個基本 -
Acoustics. noise emitted by machinery and equipment. measurement of emission sound pressure levels at a work station and at other specified positions. engineering method in an essentially free field over a reflecting plane
聲學.機械和設備排放的噪聲.工作站和其它規定場所聲壓級的測量.反射平面上基本無聲波場的工程測試法
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