double lay双线铺设doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double diaphanoscope双管透照镜double-alloy steel二元合金钢double orthogonality双正交性double-stream tube双电子束射线管double-glazed unit双层玻璃窗double-digit level两位数的水平double mass flywheel双质量飞轮double-pole dynamo又极电机double entry account复式会计double-strand mill双线轧机