????35????,12?????????????????20????????,??????????????????????“?????????????”???????

?????????????????????,?????????400??????“???????????????????????????”????,??????????????,????????????,???????????

???????,??“????”?(????????? ???)

????:?????????

??“????????????”

?? ???????????????????????

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

2??????????????

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

4???????

5?????????

????35????,12?????????????????20????????,??????????????????????“?????????????”???????

?????????????????????,?????????400??????“???????????????????????????”????,??????????????,????????????,???????????

???????,??“????”?(????????? ???)

????:?????????