This system uses a high-low supply voltage and a series resistance for increasing the working frequency of the step motor.
本系统采用了高低压驱动电源和串联电阻法，以提高步进电机的工作频率。
The blood flow frequency imaging of peritrophoblastic artery flowing was searching by pulse Doppler, it was high extending flow and low resistance.
用彩色能量图显示低速血流，用脉冲多普勒寻找高舒张期低阻力滋养动脉血流频谱。
The high frequency component would be absorbed or reflected by the low resistance layer in the crust.
这些电磁波的高频部分将被地壳低电阻层吸收和反射。
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