高中物理教学中学生普遍感到困难的一个问题是,根据振动图像或交流电图像如何写出数学表达式,其中最难的是确定初相。贵刊84年12期和85年6期发表了两篇文章,分别讨论这个问题,别的杂志也发表过文章,甚至组织专题研究,对突破这一难点有了一些帮助。但我们看到,这项工作还有一个实际教学问题,于是本文想就实际 One of the common problems students have experienced in high school physics teaching is how to write mathematical expressions based on vibration images or AC images. The hardest part is determining the initial phase. You published two articles in the 12th issue of the 84th issue of the 84th issue and the 85th issue of the 85th issue, discussing the issue separately. Other magazines have also published articles and even organized special studies to help overcome this difficulty. However, we have seen that there is a practical teaching problem in this work, so this article wants to be practical.