Waste gas pollution control of nonferrous metals industry pollution control in the textile industry 书名原文:pollution control in the textile industry Research on financial risk of M&A of nonferrous metals industry Research on financial risk of M&A of nonferrous metals industry. 并列题名：Research on financial risk of M&A of nonferrous metals industry Pollution control in the petroleum industry 书名原文:Pollution control in the petroleum industry 并列题名：Pollution control in the petroleum industry Study on the development strategy of Chinese nonferrous metals industry