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一、观察“暗盒里有什么”师:今天我们就来研究暗盒(板书:暗盒),记得上学期你们已经研究过暗盒了,不过今天我们研究的和上次研究的有些不一样,上次我们研究的是暗盒里的结构是怎么样的,今天我们来研究暗盒里面装的到底是什么?它有多大?是用什么材料做的?我们可以怎么研究啊?生:
First, observe what is in the dark box: Today we are going to study the dark box (blackboard), remember that you have studied the dark box last semester, but today we study and the last study is somewhat different, the last time we What is the structure of the cassette? What are the contents of the cassette? What material is it? How can we study it? Student: