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

2?????

3???????

4?????

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

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

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

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

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