... energy crisis 能源? ... energy density of sound 声能密度 ... energy efficiency 能源效应，能量系数，能量效率 ...
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In chapter two, wave motion equation, sound energy, sound energy flux density, sound intensity and its scaling method and the theorem of two-microphone sound intensity have been introduced.
第二章介绍波动方程、声能、声能流密度、声强及度量方法、双传声器互谱声强测量原理。
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