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

2??????????

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

4???????

5?????

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

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

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

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