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

2????????

3?????150???????

4???????????

5????????

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

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

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

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