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%?(???????????) ??????:???