double cao双槽doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double commutator二次换位子Double - stress双应力double mirror set双镜装置double reel winch双框洗涤机double outer ring双外圈double strand mil双线轧机double arced gear双圆弧齿轮double-crossing双杂交double pipe clamp复式管夹double lift dobby复动式多臂机