近年来,视听教学已在各中专卫校普遍展开,成为不可缺少的教学手段,深受师生欢迎。而大多数中专卫校仍采用的是集中在专用教室收看的方式,这种方式控制方便,教室的光线、电视机与座位的分布及音响的设计都可以充分考虑,比较合理。但是,在一个时间内只能供一个教室的学生观看一个节目,多个班级同时观看不同教学节目,就需要调整播放时间,往往影响教学节奏和内容衔接,因此,闭路电视的安装就成为当 In recent years, audio-visual teaching has been widely carried out in all secondary health schools, becoming an indispensable teaching method, welcomed by teachers and students. The majority of secondary schools still use the focus is to watch in a dedicated classroom, this way easy to control, classroom lighting, television and seat distribution and sound design can be fully considered, more reasonable. However, a program can be watched only by one classroom student at a time. When multiple classes view different teaching programs at the same time, it is necessary to adjust the playing time and often affect the teaching pace and content convergence. Therefore, the installation of the closed circuit television