单词：voice-frequency carrier telegraph
voice-frequency carrier telegraph的用法和样例：
例句
- A VF carrier system can be operated over any telephone type circuit, wire or radio.话频载波系统可利用任何电话类型的有线线路或无线线路工作。
- The technology of low voltage powerline carrier spread spectrum communication and the auto meter reading system based on it are introduced in this paper.本文就低压电力线扩频载波技术及其在自动抄表中的应用进行了研究。
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