Duplexes双冲构造duplexn.双层公寓；联式房屋adj.双倍的；复式的；[计] 双方的duplex air pump双缸气泵duplex dialling双工拨号duplex planning联式房屋平面布置duplex reulator双效调节器duplex-spiral双曲簧:牙科机头软轴附件duplex-coated复合镀膜duplex sheeting双面绒布Duplex Refining二步法冶炼duplex purchase复式蜗轮传动滑车duplex air gage双针风表, 双针气压计