西南石油大学学报(自然科学版) ›› 1991, Vol. 13 ›› Issue (2): 140-142.DOI: 10.3863/j.issn.1000-2634.1991.02.17

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  • Received:1990-12-10 Revised:1900-01-01 Online:1991-04-20 Published:1991-04-20