高中生物实验“叶绿素的提取和分离”中，需用的毛细吸管，据笔者多次实验，采用仪器站拨的毛细吸管或购买的点水笔都不够好。原因：1、仪器站拨的毛细吸管还不够细，画出的滤线较大，实验效果差，且这种吸管难握，易断；2．点水笔较难吸上滤液，或只吸点后液，画出的滤线不够? In the high school biology experiment “Extraction and Separation of Chlorophyll”, the capillary pipettes needed are used. According to the author’s repeated experiments, the capillary pipettes used by the instrument or the point pens purchased are not good enough. Reasons: 1. The capillary pipettes drawn by the instrument are not fine enough, the filter lines drawn are large, and the experimental results are poor, and this kind of straw is difficult to grip and breaks easily; Is it more difficult for the pens to absorb the filtrate, or to absorb only the liquid after the point of the pen, is it enough to draw the filter?