西南石油大学学报(自然科学版) ›› 2007, Vol. 29 ›› Issue (2): 170-174.DOI: 10.3863/j.issn.1000-2634.2007.02.047

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  • Received:1900-01-01 Revised:1900-01-01 Online:2007-04-20 Published:2007-04-20