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使用大铁桶装的酒精,多因含有铁锈而不易滤除。我们试用砂子过滤,效果很好。方法如下:于玻璃漏斗中先塞一点棉花,再铺上用
The use of large drums of alcohol, due to the presence of rust and not easy to filter out. We tested the sand filter and it worked well. The method is as follows: in the glass funnel first stuff cotton, and then spread