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

2??????????

3??????????

4?????????

5??????

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

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

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

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