Double feed systems work well if the grid voltage and frequency is very stable.
当网格电压和频率很稳定时，双馈系统工作的很好。
It is an effective work standard of radio frequency voltage.
它是一种行之有效的射频电压工作标准。
The power quality is denoted by the deviation of voltage, current or frequency, which makes electric equipments not work proper.
电能质量是指引起用电设备故障或不能正常工作的电压、电流或频率的偏差。
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