短語詞組短語vacuum arc degassing furnace 真空電弧脫氣爐Vacuum Arc Degassing VAD 真空脫氣vacuum arc degassing process 電弧真空脫氣法vacuum ladle degassing process 真空鋼包脫氣法vacuum heat degassing 真空加熱除氣vacuum -degassing 真空脫氣vacuum arc degassing 真空脫氣vacuum cycle degassing process 真空循環(huán)脫氣法vacuum siphon degassing process 真空虹吸脫氣法 返回 vacuum degassing