11????????50% ??????????????

????:????300?????:????150???????

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

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

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

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