?? ????????:????,??????????
????:1?????:????????
2?????
3?????????
4?????
5???????
?????,??????????????????????50%???????????????????????????????80%?
9???????????????28?,?????????????????????????????????,??????????????,?????????????,?????
??,???,????????????1000?????????????????1200???,??????,?????????D??????????????,??
??,??????????????????????,??????????????????(?? ?????????????????????? ??????????? ??)
????:????????????????