:(1964-),()120,2006.5ACADEMICSINCHINANo.5Sep.2006(,213022),,,,,;,,,;;;,,,,1,,,2,,40%,3,,,,?((2001)1051):,,,481©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:(1),,,;(2),,,,,;(3),,,,;(4),,,,,4,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,581©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,,,;,,,;,,,,,,,:(1),,;,,,;(2),,,,,,,,,;(3),,,,,,;(4),,,,,,,,,(5),,,,,,6812006.5©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(6),:,,,,,,,,,,;(7),,,,,,(8),,,,,,,,,,,,(1),,20,5,5,,;10,,,,,50,,,,:;;;,,,,,,,,781©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(),,,,,,,,(),,,,,,,,(2),,,,:,,,,,,,,,,,,,,,8812006.5©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(),;,,,,,,,,6,,,,,,,,,,,,,,7,:1::,19988372:,199913:,19985294:,200215:,200496:,=53,2005-7-147:(),=6725,2006-3-6:981©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.