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1·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。

2·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。

3·In this process, the supply frequency of the motor is not changed; it is always identical to the relevant mains frequency.

在此过程中，电机的供应频率是不变的。它总是与相关的主频率相同。

4·Melting characteristics of MF induction furnace have been expounded with comparison with that of mains frequency induction furnace as well as concerns in operation.

论述了中频感应电炉的特点，与工频感应电炉熔炼特性的比较及其操作注意事项。

5·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。