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

2??????

3?????

4??????????

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

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

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

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

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