Frequency converters of SIEMENS were used in the control system of sound-ing rod of blast furnace,which solve d the problem of accuracy control of t he sounding rod.是什么意思_Frequency converters of SIEMENS were used in the control system of sound-ing rod of blast furnace,which solve d the problem of accuracy control of t he sounding rod.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句