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

2?????????

3????????

4????????

5???????

?????11???????????????????30??????????? (?? ????????????????)????30????????,11???????????????50%,?????????????????0.2??,?????????????????????????6??????????????50%??????????????????????,???

????,??,?????0.3??0.9???;?????????????????;??????????????????????????????????????????????

?,11??,????50%,?????????????????,?????????????,????60%????????????????,??;????????52%???????????????,??;??55%???????????,???????????????????,??????

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