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