弯曲玻璃管是化学实验中常用的仪器，在自制过程中常常会出现里面扁平、外面扁平、里外扁平和中间细等畸形现象。为此，要自制里外均匀、平滑弯曲的玻璃管，笔者在几年的探索中注意到了以下几点，供教师在操作中借鉴和参考。 　　a.用酒精喷灯烧管时，均匀转动，左右移动，用 The curved glass tube is a commonly used instrument in chemical experiments. In the self-made process, it often appears that the inside is flat, the outside is flat, the inside and outside is flat and the middle is fine and other abnormalities. To this end, we must make glass tubes that are evenly and smoothly curved inside and out. The author has noted the following points in the exploration of several years for teachers to use for reference and reference in their operations. a. When burning tube with alcohol torch, rotate evenly, move left and right, use