摘要
闭路电视单向控制 ,阻碍了先进教学方式的施行 ;笔者通过实验 ,在闭路电视原有功能的基础上稍做改制 ,变单向控制为双向控制 。
unidirectionally controlling the closed circuit television drawbacks the advanced teaching type.On the base of the former function of the closed circuit television, though experiment, the writer alters the unidirectional controll into bidirectional control, by doing this, the function of the teaching closed circuit television system will be adequately brought into play.
