When traditional method is used for measurement at low frequency range, measuring precision can not be guaranteed and measuring is time-consuming.
传统的频率特性测量方法，在低频时，测量精度较差，且非常费时。
The viscosity coefficient of pore fluid in saturated sandstone has an obvious effect on the attenuation, modulus, and velocity dispersion in low frequency range.
饱和砂岩中扎隙液体的粘滞系数对饱和砂岩的衰减、模量和速度色散的影响在较低频段是明显的。
Pressure difference and Cd concentration fluctuation may cause the noise to increase many times with the latter mainly enhancing the noise in the low frequency range.
气压差及镉浓度波可使噪音增大很多倍，浓度波主要增强了低频噪音。
Pressure difference and Cd concentration fluctuation may cause the noise to increase many times with the latter mainly enhancing the noise in the low frequency range.
气压差及镉浓度波可使噪音增大很多倍，浓度波主要增强了低频噪音。
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