这一课研究的是声学理论,要求学生认识到声音是由物体振动产生的,培养学生归纳推理的能力。这一教学目的是通过一系列的学生实验来完成的,其中钢尺发声和弹动绷紧的皮筋发声是两个主要实验,由于材料易得,教材叙述得很详细,要求学生照着做。我认为这些实验的做法是次要的,学生一看就会,关键 This lesson is about acoustics theory, which requires students to recognize that sound is generated by the vibrations of an object and to develop the ability of students to deduce reasoning. The purpose of this teaching is through a series of student experiments to complete, including the sound of steel and elastic stretched rubber band is two main experiments, due to the availability of materials, textbooks described in great detail, require students to follow suit. I think the practice of these experiments is secondary, the students will see the key