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

2???????????

3??????????

4???????

5?????

?,????????50%??????????????????????80%?

9???28????,??????????????????????,???,??,???????????????

??,????,?????????????????1000????????????????????????1200????????????????????????????????????,??????????????????????????,????D???????????????????????????????,??????????

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

?:???????????????????