The solution was the addition of potassium permanganate in condensation zone of rectification tower to improve the quality of alcohols.
可在精馏塔的浓缩区域添加高锰酸钾来提高酒精质量。
In desertification areas of northwest China, the water content in the unsaturated zone originates from atmospheric precipitation and from water condensation.
西北荒漠化地区，包气带中的水分除来自大气降水外，还来自凝结水。
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