持续工频电压 power frequency discharging voltage: 工频放电电压power frequency sparkover voltage: 工频跳火电压(避雷器的)power frequency withstand voltage: 工业频率耐压,工频耐压水平power-frequency voltage test: 工频试验power-frequency withstand voltage: 工频耐压下载手机词典可随时随地查词查翻译