(,250014)[],,,,:,,[];;[]F840[]A[]1005-913X(2004)02-0061-03():,,:,,,;,,;,,(),,,,,,,,,,,,,,,;,,,()11,,,,21,1000,,,,31,,,,411515,,,,15,,15,,(),,,,1620042NORTHERNECONOMYANDTRADEBEIFANGJINGMAO©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,,(),,,,,,,,,,,,,,,,,,,,,,,,(),:,,,,()(),,,,18%,8%,10%,5(),,,,,(),(),,,,,(),,,,,,,,,,,,,,,,,,,,[][1]1[J]1,2003,(5)1[2]1[J]1,2003,(1)1[3]1[M]1:,20011[4],1[M]1,20031[:]26NORTHERNECONOMYANDTRADE20042BEIFANGJINGMAO©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.