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

????:?????:???????????

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

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

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

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