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

2????????

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

4????????

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

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

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

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

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