telegraphy carrier current 载波电报术

carrier telegraphy 载波电抱 ; [通信] 载波电报 ; [通信] 载波电报学

carrier current telegraphy 载波电抱

voice-frequency carrier telegraphy 音频载波电报术

high-frequency carrier telegraphy [通信] 高频载波电报

carrier telegraphy communications 载波电报通信

VF carrier telegraphy 音频载波电报

channel carrier telegraphy 音频多信道载波电报

voice frequency multi-channel carrier telegraphy 音频多信道载波电报

carrier r telegraphy 载波电抱