?? ??????????????????????:??????500???
????:1??????????:????????
2??????
3?????
4?????
5???????
??,????9 ??????????? 20 ??????????????,“?????????????????????????”???500????????,???????????????????????????????????????76%?
???????,?????????????????????????9???????????????????????????????,???2.5???,12?????????????10?????????,?????????,???
????????????????5.6???????,??2012???,?,????????????????
(????????? ??? ???????????????? ?? ???? ?? ???? ??? ????? ?? ???????????? ?? ?????? ????) ???:???