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 railway track双线铁路
double throw contact双向触点
Double-foil shield双圆弧罩盖
double cutting drill双刃钻
double action piston两面作用活塞
double acting switch双动开关
double-arch tunnel连拱隧道
double-current key双流按键
double charging bell双料钟
double doping method双重掺杂法