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近年来,国外大量地将各种现代化视听设备应用于教学过程,从而形成了一门新的学科——视听教学。在我国则称之为电化教学,经过几年来的努力,已有相当进展。在这些现代化的视听设备中,尤以投影仪操作简便,易于推广。把投影技术应用在化学演示实验,可以提高演示效果,具有以下五方面优点: 1、由于投影能够把实物放大好多倍,可以使原来看不清的实验现象看得清晰。尤其是在大教室中使用投影实验,可以使远处的学生也能看清演示实验。
In recent years, a large number of modern foreign audio-visual equipment has been applied to the teaching process, thus forming a new subject-audiovisual teaching. In our country, it is called electrification teaching. After years of efforts, considerable progress has been made. Among these modern audio-visual equipments, projectors are particularly easy to operate and easy to promote. Applying projection technology to chemical demonstration experiments can improve the presentation effect. It has the following five advantages: 1. Because the projection can enlarge the actual object many times, it can make the original unsightly experimental phenomenon clear. In particular, the use of projection experiments in large classrooms can enable distant students to see demonstration experiments.