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