double rig双隐睾doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double isotope derivative method双同位素衍生物法double-bell charging mechanism双钟装料机构double-end hexagon ring wrench双头六角扳手double stage current transformer双级电流互感器double-random phase-encoding双随机相位编码double-star positioning system双星定位系统Double Rope Single Overhand Knot双绳单向半结double cylinder jacquard machine双针筒提花针织机double diffusion epitaxial plane双扩散外延平面double-grid ionization chamber双栅电离室

start stop double current channel起止式双流电路

double seated main stop valve双座式主汽门