double gapadj.双火花间隙的
doubleadj.双重的;成双的;两倍的v.翻一番;使 ... 加倍n.两倍;双份
double-twin coil shank带双弹簧圈的铲柄
double beam interference双光束干涉
double edge grooving saw双刃开槽锯
double involute - gear双渐开线齿轮
double-cylinder engine双缸发动机
double-drum rope winch双滚筒绞车
double swinging scaffold双层吊篮
double engine power unit双发动机动力装置
double flight feed screw双头螺旋加料器
double spectroheliograph双筒太阳单色光照相仪