dualistn.二元论者dualadj.双重的；成双的n.双数dual Buck inverter双Buck逆变器dual amplification双重放大dual-chip system双芯片系统dual-motor drive双电动机传动dual toroidal yoke双环形偏转线圈Dual beamformation双波束合成dual-certificate双证课程Dual position loop双位置环dual-phase steel[化] 双相钢dual CPU structure双CPU结构