According to the '12th Five-Year Plan', China's accumulative total investment will inject about 5.4 trillion RMB into environmental protection, which has huge potential in the field of energy conservation and as well as environmental protection itself. It is clear that the new technology of environmental protection will be a 'sunrise industry' in China's industrialisation process. While the new filtering technologies play an important role in the grand project, the research and development of filters have an important practical significance.
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