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迷糊虫刘

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[求助] 环境化学的两道英文题,急求答案

1.Use calculation to explain why the surface water in the natural river or pond systems is often oxidized, while the bottom water is reduced
2.Changes in air quality concentrations for some pollutants do not always match changes in nationwide emissions. For example, if the emissions of SO2 and PM2.5 decrease by 33% and 17%, respectively, but their ambient concentrations decrease by 54% and 8%, respectively. Why didn’t the ambient air quality concentrations change proportionally with nationwide emissions?
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