wave energy density and flux
波的能量密度和通量
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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