知识是在感知的基础上形成和发展起来的,课堂教学是传授知识的一个重要途径,而直观教具的使用可以将知识形象化、具体化,便于学生对知识的掌握和理解,但如何有效地使用也是一个值得研究的问题.(一)使用的必要性人的感受由于受到刺激物的持续作用将会出现一种适应,一个腔调讲到底,一种方式讲到头,会使学生的视听产生适应性.在教学中为防止这种消极的适应现象,往往要恰当地使用直观教具.早在十七世纪捷克教育家夸美纽斯就在他的《大教学论》中提出:“在尽可能的范围以内,一切事物都应尽可能地放在感官的跟前.” Knowledge is formed and developed on the basis of perception. Classroom teaching is an important way of imparting knowledge, and the use of visual aids can visualize and embody knowledge to facilitate students’ mastery and understanding of knowledge, but how to effectively The use is also a question worth studying. (1) The necessity of using people’s feelings Because of the continuous effect of the irritants, there will be a kind of adaptation, a tone to the end, a way to talk about the end, will make the students’ audiovisual adaptation In order to prevent such negative adaptation in teaching, it is often necessary to use visual aids properly. As early as the seventeenth century, the Czech educator Comenius put forward in his “Grand Teaching Theory”: “As much as possible Within the scope of the study, everything should be placed as far as possible on the senses."