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

2???????????

3????????????

4?????

5??????????????

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

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

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

?????????????????????????,???,?????????????????,??????????,?????????????,?????????????????11???????,?,?????(??????) ????????????:????????????????