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。
Atmospheric vapor phase catalytic condensation of formaldehyde with acetone for manufacture of methyl vinyl ketone has been studied.
以硅胶为催化剂，丙酮和甲醛可经常压缩合反应合成甲基乙烯基酮。
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