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

2????????vx

3???????

4?600?2??????????

5????????

21??,?????????????????????,?,?????????????,?21????????????????????????

9?????24???????28?????,??21???????????????????????????,?,???????????????15????,??????????????

???,????????????????????????????10?,??????????????2.3????????????,??????????????????????????????????????????????

??????????8???,?2441.3??????,??21.8%,????????????????52.6%,???????????

?? ??

????????21?????????????,????????????????????,??????????,????

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

????,????,?,??2100?????????????,????????????9??,????,??????????????3.1???????????,??????????6500??????????,?,??????????2???

???:??????????????,???????????????????????,?? ???????????????:????????????