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1 声音传播实验的改进 现行义务教育华东版课本在演示声音能在空气中传播时,要用到价格昂贵的抽气机,大部分学校都没有,很难做成。笔者在教学中,购置几只气球,配合一些常用仪器,也能达到同样的演示效果。
1 Improvement of Sound Communication Experiments The current compulsory education East China textbooks use expensive suction machines when demonstrating that sound can be transmitted in the air. Most schools do not have them and it is difficult to make them. In the teaching, the author purchased several balloons and used some common instruments to achieve the same demonstration effect.