vacuum arc真空电弧vacuumn.真空；真空吸尘器；空白adj.产生（利用）真空的v.用吸尘器打扫vacuum crystallization真空结晶vacuum pressure valves真空压力阀vacuum interface board真空接口板vacuum welding machine真空焊箱vacuum casting machine真空铸造机vacuum pulse nitriding真空脉冲渗氮vacuum trabeculoplasty真空小梁成形术vacuum dryer with rake[化] 真空耙式干燥器vacuum pre-stressing真空预压vacuum decarburization真空脱碳