This paper discribes several components of variable frequency speed controlling in living district constant-pressure water feed,introduces a constant-pressure water feed system make up of iPF inverter(lays inside IWS constant-pressure control device).是什么意思_This paper discribes several components of variable frequency speed controlling in living district constant-pressure water feed,introduces a constant-pressure water feed system make up of iPF inverter(lays inside IWS constant-pressure control device).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句