1. 工频：vector equation 向(相)量方程 | power frequency 工频 | capacitance effect 电容效应
2. 电源频率：power filter 电源滤波器 | power frequency 电源频率 | power fuse 电源保险丝
3. 电流频率：power fluid 传动液 | power frequency 电流频率 | power fuel 动力燃料
4. 工业频率：power flow 电力潮流 | power frequency 工业频率 | power frequency withstand voltage 工业频率耐压
1. Horstmann said the network's safety mechanisms functioned perfectly, heading off a dangerous drop in the frequency of power supplies.