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