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 scanning双面扫描duplex practice双联法duplex cylinder双气缸duplex strainer双粗滤器duplex pull rod双拉杆duplex apartment双层公寓duplex telephone双工电话duplex formation双链体形成duplex engraving双面印花滚筒雕刻duplex air gauge双针风表, 双针气压计