closed circuit television line
(7)闭路电视线(closed circuit television line) 家家户户使用的闭路电视线缆的频带是很宽的,而闭路电 视信号只占用高频段部份,低频段是空闲的,因之,其低频段 部份可用来传输...
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闭路电视线 cctv line
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短语
闭路有线电视
Closed Circuit TV
闭路电视共用天线系统
closed circuit television common antenna system