人民教育出版社出版的九年义务教育三年制初级中学教科书,《生物》第二册实验七(50～51页)中有这样两组图(见下图一).图中的滴管与试管壁接触,该图与新编《化学》教材在关于滴管的使用说明有出入.人民教育出版社出版的九年义务教育三年制初级中学教科书,《化学》全一册第310页中对滴管的使用说明是:“使用滴管时.应用手指捏紧橡胶乳头,赶出滴管中的空气.然后把滴管伸入试剂中.放开手指.试剂即被吸入.取出滴管把它悬空放在烧杯上(不要接触烧杯壁.以免沾污滴管或造成试剂的污染),然后用母指和食 Nine-year compulsory education three-year primary school textbooks published by the People’s Education Publishing House, and two sets of diagrams in Experiment No. 2 (50-51 pages) of Biology (see figure 1 below). Contact with the wall of the test tube. The figure and the new “Chemistry” textbooks differ in the instructions for use of the dropper. Nine-year Compulsory Education Three-year Compulsory Primary Middle School Textbook Published by the People’s Education Publishing House, “Chemistry,” Volume 1, page 310 The instructions for use of the dropper are: "When using the dropper, apply fingertips to squeeze the rubber nipple out of the air in the dropper. Then insert the dropper into the reagent. Let go of the finger. The reagent is inhaled. Remove the drop. Place it in the beaker by hanging it on the tube (do not touch the wall of the beaker so as not to contaminate the pipette or contaminate the reagent), then use the finger and food