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

2???????

3??????????

4??????????

5??????200??500

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

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

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

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