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-h class ridge estimator双h型岭估计double-fold disappearing stair双折隐梯double-column hydraulic planer双柱液压刨床double reference beam holography双参考光束全息学double porosity -throat system双重孔喉系统double lumen endobronchial tubes双腔支气管Double seats for stretching legs双人坐蹬double-edge safety razor blade双面安全刀片double-suction centrifugal pump双吸离心泵double order amplitude modulation二重调幅信号