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

2??????

3??????????

4???????

5????????

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

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

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

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