?? ?????????????? ?????????
????:1????????:???????????
2???????
3?????
4?????
5???????vx
????????????????2??12???? ??????,???????,???????????????????????????4~8???????,?????????????10?;???????????????6~8?????????????,??10~11????????
???????????,??,?????????????4~5????,?????????????????????????????4~6?,??8?,????????????8~10????????????????????????????6~7????????????
?????????:??????,???,????????????????,??;???????????????????????????????,?????
??:???????????????????,????????,???????;????????,??????;??????????????????,?????
??:?????????????