短語詞組短語electric c discharge machining 電火花加工electric discharge machining technique 電火花加工工藝ultrasonic electric discharge machining 超聲電火花Electric discharge generating machining 電火花展成加工EDM electric discharge machining 電加工Wire cut Electric Discharge Machining 電火花線切割機床model nc electric discharge machining 數(shù)控電火花加工electric discharge machining edm current 放電加工電流electric discharge machining in gas 氣中放電 返回 electric discharge machining