从实用的角度出发，概述了电化教学闭路电视系统前端部分的设计思路，从频道设置、线路设计、电平计算、设备选型等方面具体阐述了电化教学闭路电视系统前端设计的基本概念和方法。
This paper, by combining theory and practice, deals with the design of the front part of the dosed circuit TV system in the audio-visual teaching and some relative points for attention.
在新界区，荃湾和葵青的区域交通控制及闭路电视摄影机系统为130个路口控制交通灯号，并设有22部闭路电视摄影机，监察交通情况。
In the New Territories, the Tsuen Wan and Kwai Tsing ATC and CCTV systems controlled signals at 130 junctions and monitored traffic conditions through 22 CCTV cameras.
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