????:1?????200??vx????:???????

2???????

3?????????150

4?????

5???????

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

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

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

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