double-un.字母w
doubleadj.双重的;成双的;两倍的v.翻一番;使 ... 加倍n.两倍;双份
double-coincidence switch双重合开关,二重符合开关
double-action disc harrow(双列圆盘靶) 双功圆盘靶
double network transmission双网传输
double-variable principle双变量原理
double scoop type excavator双斗式挖土机
double flow lines operation双流水线作业
double-side hacksaw blade双面刃钢锯条