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XXX21220016V01.21No.2JournalofSuihuaTeachersCollegeJun.200112(12410081):,,:,,,:P95:A:1004-8499(2001)02-0023-0320670,,,,,,,:?,1972,,1979()62:,,,;281:,,;:(),,,,(),:,,,,,():,,,,,,,,:(),,(),(),32XXX[],;,[]2000-11-13©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.():,,,,;,,1989,24:,,,:,,;,,:(),()1979()62281,,,:(),:1.,2.,;,,3.(),,1.:,,,,,2.,,3.(),,4.(),,5.,,,,,,:;,,;,,,,:(),:1.,,2.,,3.,(42©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)()()1.:(1),,:,,(2)(),:,,(),,,(),:,,,,,,,,,,,2.,,:(1):,,,,(),(2):,,,,(),(3):,,,(),,,3.:(1)(2),(),,(4):(1),(2),,,,,,,[][1][M]1995[2][M]1996[3][M]1998[:]52©1994-2009ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.