double tapph.doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double contrast examination双重对比检查double binocular microscope双人双目显微镜double airbridges technique双空气桥工艺double reading milliammeter双向毫安表double angle milling cutter双角铣刀double-strand pig machine双链式铸铁机double-pressure condenser双压凝汽器double contrast radiography双对比X线造影(术)double membrane loudspeaker双膜式扬声器double resonance experiment双共鸣实验