©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(150080),,,,,,,,,11.1,,1.1.1,,,,90,,,,,,1.1.2,,,1.1.3,,1.1.4,,,1.1.5,,,1.2,1.2.1,,,,,1.2.2,,,1.3,,,,,,,32()19972©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:4218.9%,2611.7%,11350.9%,4118.5%,,,,,,,,,,,,,,,,,,,,,,,2.3,,2.3.1,,,,2.3.2,,,,42()19972©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.()19972©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.200233,,,,,,,,,,,,,,,,,,80,,,,,,34%,,,,,,,,,,,,,,,,,,,,,,,1..,19952..,19853..,1994,(2):274..,1995,(3)5..,1995,(2)62()19972