贵刊今年第四期刊登的《井水是不是纯净水的实验之改进》一文,介绍了对教材中实验的改进办法。改进之后,实验结果确实更明显。但是改为用烧杯装井水烧干,时间大为增加,不太合算。 The article published in the fourth issue of this year, “Well water is not pure water experimental improvements,” a text, introduced the experimental methods of teaching materials to improve. After the improvement, the experimental results are indeed more obvious. But instead of using a beaker mounted well water to burn, the time greatly increased, not too cost-effective.