A??????????????

??????????????1?21?? (???????? ???????????????????????)????????????A????21???????????(??)?????,????????,?????????????

???,?????????????????????3.89%?????????3.26%,??A?????????????,????20%??????????,???????????????9%?

??????????????????,????????????????“1+N”??????????????????????????????????“1+N”???,????????100???,??

??,????????????:?????????????,???;?,?????;??????????????????,??????

??,??,????????????????2.16%??;?????,?????????????????????10%?

???????,???????????,???3242?,????????0.05%;??????10305?????,?0.48%;????2112??????,???????0.36%?(???) ?????:??????????