??????20????????????

????:?????????:???95?98?

?????????????8???????????????31? (?????? ????????)??8?????????????????31???????????????,8??????????????50.3%,???20?????50%??,??????????????????

???????????????,????,???????0.6?0.1???????????????????;?????????????????????????????????????????????????????,??????????????????????0.3?2?????????

??,8??????????????????????,?????50.3%,??20???????????????????50%??????????,????????????????????????????????????????50%??,???

????,???????8????????????,???50.2%,??0.2??,???????????????????????,?????,??????

?????????????,??????????,???????????55%???????????????????;????????,???,??60%?????

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