Especially in the United States Department of Engineering and Research and development efforts in the case; methods are considered in the selection of materials to the state to promote the concept of environmental protection; U.S. companies to invest a lot of special people and material resources into the development of a full range of materials; center ring He shall prevail; efforts in various sectors; in 2004, a study of the total success; prepare batches of the same material, Guangdong Exhibition 2004 best innovation in environmental technology unit.

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