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The methods for calculating low limit frequency and coupling capacitance are discussed in detail.
详细讨论了下限频率和耦合电容的计算方法。
Now most sound absorption layers are impedance transition constructs, which have been used widely, but their thickness is limit and cannot meet the need of absorbing sound at low frequency.
现代应用较多的吸声层大部分是阻抗过渡式结构，但是厚度有限，无法满足低频吸声的要求。
The low-frequency limit in the parallel orientation was higher than that in the perpendicular orientation;
平行方向的低频极限量高于垂直方向的低频极限量；
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