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

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

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

4????????

5????95?98?

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

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

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

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