The second theorem defines the Equivalent Magnetic Charge and the Moment of Current Density.

第二个定理定义了“等效磁荷”与‘电流密度矩’。

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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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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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