- dcd double channel duplex
- 双通道: binary channels; two-channel ...
- 双工制: duplex system; duplexing sys ...
- 双通道双工: double channel duplex; double-channel duplex
- 双工制: diplex system; duplex system; duplex way system; intercommunicating system
- 双波道双工: double channel duplex (dcd)
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