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

2????????????

3?????

4???????????

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

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

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

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

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