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投影是一种使用方便的电化教学手段。它不需要电影、录像教学的设备条件，又能弥补挂图教学的不足。但许多教师却只把它当作一般挂图用，没有真正使投影仪的优势发挥出来。下面就投影教学中两点容易被忽视的问题谈点作者看法。１．利用投影仪放大实验材料有些演示实验由于...
Projection is an easy-to-use audio-visual teaching method. It does not require equipment conditions for film and video teaching, but also can make up for the lack of wall chart teaching. However, many teachers only use it as a general wall chart, which does not really make the advantage of the projector. The author’s views on the two issues that are easily overlooked in projection teaching are discussed below. 1. Using Projectors to Amplify Experimental Materials Some demonstration experiments due to...