Based on wave acoustics, the lowfrequency sound field is analyzed in this paper, and reciprocity is verified both theoretically and experimentally.
文章根据波动声学的观点对房间内的低频段声场做分析，理论和实验都验证了这个结论。
2
Taken the Earth as material of antenna for receiving gravitational wave, the Earth behaves as a low-frequency gravitational detector.
将地球作接收引力波的天线物质，地球就成为了工作在低频段的引力波探测器。
3
Improper initial value will result in errors of lowfrequency component, relative wave impedance and stratum thickness to cause pitfalls of seismic data interpretation.