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Chen Guoqi at the Ministry of Environmental Protection is in charge of air quality monitoring in north China. He said the industrial layout of the region is problematic and the adjustment process is slow. So severe problems have emerged in north Chin
发表于:2019-01-17 / 阅读(70) / 评论(0)
2015CRI中国国际广播电台
2015CRI中国国际广播电台