11??????????????50% ????????

????:?????100????:??????200??500

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

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

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

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