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

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

3?????????

4???????

5???????

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

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

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

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

??:?????