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

2?????????

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

4?????????

5????????

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

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

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

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