短语词组短語CCTV Display System 閉路電眡顯示系統cctv system schematic diagram 監控系統示意圖cctv system of tunnel 隧道閉路電眡系統Closed circuit television CCTV system CCTV 系統Data records of CCTV system 閉路電眡資料記錄CCTV and Alarm System Cables 閉路警報系統 返回 CCTV system