EC-HM FR. Tronic cranes have a continuously variable power supply to their hoist gear, slewing gear and trolley travel gear drives via frequency converters.是什么意思_EC-HM FR. Tronic cranes have a continuously variable power supply to their hoist gear, slewing gear and trolley travel gear drives via frequency converters.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句