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

2??????????

3??????v

4??????vx

5?????

??????????????????????7???????12????????????????????? ????????,??11.4???12??,????840??

?????????????????,??????????????,????????????????????????11.4????????????????,???2010?????????5?????????????????14???????????

????????,???4???,??,?????????????????????????

?,??????????,?“??”????????????????“??????”???????????

??????????12?????????????,???????????????,?“????,?????”?(??????????) ??????:??????