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１．配置浓度为１／２０００（即５‰）的油酸溶液为什么要通过两次配置？ 答：所谓两次配置就是在１００ ｍＬ量筒中准确地放入９５ｍＬ无水乙醇，再用吸管向量筒中放入５ｍＬ油酸，充分搅拌后，得到５％浓度的油酸溶液，装入棕色加盖细口瓶中并贴上注有“５％油酸溶液”的标
1. Why does the oleic acid solution with a concentration of 1/2000 (i.e. 5 phr) pass through two configurations? A: The so-called two configurations is to accurately place 95 mL of anhydrous ethanol in a 100 mL graduated cylinder, and then put 5 mL of oleic acid into a straw tube. After stirring well, obtain a 5% concentration of oleic acid solution, and put it in a brown cap. In the bottle and labeled with “5% oleic acid solution”