,,,,,,,2003,,,,,,,,,,:(),,,(,),,,,,,,():,,20,,,,,,,,,,,,,,,,,:167126914(2004)05200242(04),(),,,,,,,,,20,;304250©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,,,,,;,,,,,,,,,,,,;,,,,,,;,,,,,,,,,,,,,,,,,,,,,:,,,,,,,:,,;,,,,,,,,,,,,,,,,,5220045():,1982126(1),1992,447©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,,;,,,,,,;,;,,:167126914(2004)05200272(03),,()1954,,50,,,,,!,,,,,,18,,,1(P312),2(P281),3(P111),,,,,19401,:,4(P677)19497220045()©1994-2008ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.