“使用高倍镜观察几种细胞”这个实验的教学内容比较简单,只要求学生能够基本掌握显微镜的使用方法.但在实际进行课堂教学时会发现,要在一个课堂教学时间内靠学生自己操作显微镜完成学习内容,其实并不简单,主要原因在于学生不太会使用显微镜.对于显微镜使用的初学者,整个显微镜使用过程中,最难的操作是用粗准焦螺旋调节低倍镜的焦距.造成这困难的原因有以下几个: “The use of high power lens observation of several cells ” The experiment teaching content is relatively simple, only requires students to basically grasp the use of the microscope.But in the actual classroom teaching will find that in a classroom teaching time by the students themselves The main reason is that operation of the microscope to complete the learning content, is not simple, the main reason is that students are less likely to use the microscope for beginners to use the microscope, the whole microscope, the hardest operation is to use coarse coke spiral to adjust the focal length The reasons for this are as follows: