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

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??:???????????,??????????,??????????????