Journal of Northeastern University Natural Science ›› 2002, Vol. 23 ›› Issue (9): 907-910.DOI: 10.12068/j.issn.1005-3026.2002.09.026

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  • Received:2002-09-30 Revised:2002-09-30 Online:2002-09-15 Published:2014-10-22
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