double row双行doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-slotted Fowler flap双缝富勒襟翼double taxation of dividends对股利的双重徵税double-pipe heat exchanger套管换热器double fuel injection nozzle双路离心喷嘴double limit current circuit双限流电路double-connected rectifier双重连接整流器double circuit tangent tower双回双分裂直线塔double-stranded cyclic DNA双链环状DNAdouble-drum electric block双滚筒电葫芦Double-balloon enteroscopy双气囊小肠镜