Therefore it can be seen that it will "smooth" the "twice mains frequency DC" into a near constant DC voltage.
因此它可以把“两倍于电源频率的直流电”进行“平滑化处理”，成为一个接近恒定的直流电。
The article introduces the composition lining of the mains frequency coreless induction furnace with short coils.
本文介绍短线圈工频无心感应保温炉采用的复合炉衬。
This produces a waveform of one polarity operating at a frequency twice that of the mains supply.
经过整流后得到的是一个频率为交流电源两倍的单极波形。
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