double net双网doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double pipe heat supply system双管供热系统double--balloon enteroscop双气囊小肠镜double screen printing machine双面绢网印花机double-V connected rectifier双星形联接整流器double-layer cable structure双层索结构double-face corrugated board双面瓦楞纸板double horsehide leather strop双层马皮革砥double end spark plug wrenches两用火花扳手double chateaubriand bearnaise铁扒牛柳double-current bridge duplex双流桥接式双工