试管刷是化学实验中最常用的仪器。我们常用的试管刷是毛刷或塑料刷。这样的试管刷对于难溶的物质是很难刷洗的，如制取酚醛树指的试管做银镜反应的试管，加热硫的试管等都是非常难刷洗的，既浪费药品又费时间，非常不方便。为解决这一问题，我制作了一种新型试管刷。新型试管 The test tube brush is the most commonly used instrument in chemical experiments. Our commonly used tube brushes are brushes or plastic brushes. Such a test tube brush is difficult to scrub for insoluble materials, such as making a test tube of a phenolic tree test tube as a silver mirror reaction tube, heating a sulfur test tube, etc. are very difficult to scrub, both waste of drugs and time, very inconvenient. To solve this problem, I made a new test tube brush. New test tube