The screw plastic extruder and tractor adopt the imported A.C.frequency control set.Both vacuum pump and pulling motor use high quality products.是什么意思_The screw plastic extruder and tractor adopt the imported A.C.frequency control set.Both vacuum pump and pulling motor use high quality products.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句