对二级减速器BP网络模型进行了结构修正与优化计算。
The structure revise and optimization calculation has been made to secondary decelerator BP network.
经过修正聚类模型计算，确定2004年杭州市环境空气综合质量等级为二级，已达到该地区规定的环境空气质量标准。
By using the modified model, comprehensive grade of Hangzhou atmospheric quality in 2004 is grade II, which attains this city's atmospheric quality standard.
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