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

2??????400?4??

3????450???

4??????

5??????????

???????????10??????7????????? (?????????? ???)????????????????7?,????????????76????????????????????700?????????????52???????300?????????,???????????????,??????5.3%?11.3%?

?????75??????,???????????,???????????,??????????,?????????

????,??,????????????,????????????,?????????????????????????,???????,???,????????????????????,???

?,??????????10???7???????17??,??????????????????,??????5????;????????????,???????????(?????????) ???:??