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

2??????????

3????????????

4??????????

5????????????

??????????????12??????????????????12?? (?? ??)12?????????12??,??“??60”?(???????????????????????????????????“???????60”)????,???????????“?????????????12”????????????????,?????????,?????????????

??? ???

“???????60”????,???????

????????????????????????????????????????????????????,????????????????????????????????????????????,??6??,?9000?????????????,????(?????????)????,????????????????????????????

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

???:???