Received:November 08, 2011  Revised:February 13, 2012
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DOI：10.3969/j.issn.2095-1744.2012.02.000
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周 荣，吴钦生 1.北京矿冶研究总院 工程公司，北京， 2.湖南三一工业职业技术学院，长沙，
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