在上《纸飞翼》一课时,要求学生运用对比的实验方法来验证飞翼留在空中的时间长短与飞翼的什么特征有关。做实验前,我首先介绍什么是对比实验,以及对比实验要注意的事项,并反复强调在对比实验中,我们除要验证的那项内容以外,其他的条件都要相同。比如说,要验 In the “paper flying wing” class, students are asked to use comparative experimental methods to verify the length of time the flying wing remains in the air and flying wing characteristics. Before doing the experiment, I first introduce what is a comparison experiment, and what to keep in mind when comparing experiments, and repeatedly emphasize that in a comparative experiment, we have the same conditions except for the one we are trying to verify. For example, to test