The trend of the wet deposition between 1987 and 2004 in Beijing city was analyzed by using two parameters, e. g. precipitation acidity and wet deposition fluxes.

通过分析降水酸度和沉降量2个酸沉降控制指标，得出北京市近二十年（1987~2004）湿沉降特征变化趋势。

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