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.
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。
It covers learning theory, the learning environment, preparing to train, training delivery, audio visual support, and group and individual exercises.
它包括学习理论，学习环境，准备培训，提供培训，视听支持，团体和个人的练习。
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