simplex-duplex pump 单效双泵
compatible simplex-duplex radio communication 单双工兼容无线电通信
simplex duplex pump 单作用双联泵
duplex-to-simplex connector 双向对单向连接器
simplex and duplex switch 单双工转换键
simplex and duplex 单工与双工
connector duplex-to-simplex 双向对单向连接器
Simplex: Data communication in one direction only. Contrast to Full duplex , Half duplex.
单向：数据只作一个方向的传送。有别于全变向，半变向。
Telegraph repeater. One-way simplex, two-way simplex, or duplex operation can be specified.
电报中继器。可指定为单向单工、双向单工或双工运行。
Many traditional single simplex communication devices now can act as a duplex system under the help of voice activated module, which is actual voice activity detector.
很多单工的通讯设备可以通过语音检测技术的应用实现收发状态的自动转换而以比较小的代价达到双工设备的功能。
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