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

2???800??

3?????

4?????????

5??????????

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

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

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

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