????:1??????:???????

2???????

3??????????

4?????

5??????

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