小学自然教学仪器中的６３４号和中学化学教学仪器中的６２７３号都是胶头滴管，实验中经常使用，在实验教学管理过程中发现：一部分教师和绝大多数学生使用时不规范，经常出现如图１－（ａ）所示的不正确操作情况。使用滴管时必须注意用无名指和中指夹住滴管，将它悬空地... 634 in primary natural teaching instruments and 6273 in middle school chemistry teaching instruments are all plastic head droppings, which are often used in experiments. During the experimental teaching management, some teachers and the vast majority of students did not use norms, often The incorrect operation shown in Figure 1- (a) appears. Care must be taken when using a dropper to hold the dropper with the ring finger and middle finger and leave it open.