©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(,511363):,:;;;,,,,,[1],,,:,,,,[2],,,,,1.,,,2009,39.0%;627,54.9%,;754,31.6%;,18%,200753%,,1000,,,,,,8090,,,,,1/32.,100,,,,,;,,,,,,,70%50%,10%25%,71%,1:2:7,,,2500,503.,,©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:,,;;,:,;,;,,,,,1.,,,,,,,70,,,,,,2.,,,,,,,,,;;,,,,,,,;,,,,,,,,,,,,3.,,;,,,,,,;,;,;,:[1]..,2005,12(6):77.[2]..:,2006.48.[3].[EB/OL].[2009-03-18].:,;: