????:1???????????:??????200?????

2?????vx

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

4?????????

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

?????12?????????????12?? (? ??????????)????????12??????,??????,12??,???????

????????????,??????12????,?,13??5??????,??????????????????1????;????????????,?????????????;?????????????????????????????????,????????????

???????,????????????,12????13???3??,??6?7??????,?????????????3~5?,??????????-5~-3??

????,????????????????,???????????,????????,??,?????;?????,???,???

????????????,???????????,??????,??,???????????????,13??????,???????????,??????????????;????????????,?????????(?????) ??:??????