1　玻璃管的弯制在化学实验中经常用到玻璃弯管 ,它是用玻璃管弯制而成的。在通常的弯制过程中 ,弯头会变形 ,变得扁瘪 ,既影响导气又影响美观。为解决这一问题 ,笔者先用纸将玻璃管一端堵起来 ,再装入细沙 (沙子高出弯点 4cm～ 5cm) ,然后用酒精喷灯弯制。用这种方法制出的弯 1 Bending of Glass Tubes Glass bending tubes are often used in chemical experiments. They are made by bending glass tubes. In the normal bending process, the elbow deforms and becomes flat, affecting both the air conduction and aesthetics. In order to solve this problem, the author first used paper to block one end of the glass tube, and then put it in fine sand (sands are 4cm to 5cm higher than the bending point), and then bent with an alcohol torch. Bend made in this way