[网络] 闭路电视机 circuit, closed: 闭合电路closed circuit: 【无线电】闭路式(电视)。 closed-circuit: adj. 闭路式的。 blocking relay for closed circuit: 合闸闭锁继电器cc closed circuit: 闭合电路下载手机词典可随时随地查词查翻译