Journal of Northeastern University Natural Science ›› 2002, Vol. 23 ›› Issue (8): 718-721.DOI: 10.12068/j.issn.1005-3026.2002.08.002

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  • Received:2002-08-30 Revised:2002-08-30 Online:2002-08-15 Published:2014-10-22
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