?? ???????28??????
????:1???????:??????????
2??????????
3????????
4?????vx
5??????
?????????????11?29?????????? (??????? ???)??(????????????????????)29?????????????????????????????????28????????????,??????????400??????????
??28?????????????????,?????,?????“????????????,??,???”???????????,?????????????????????????,?????????,???????????????,???????,??????????,??????,???????
??????????????????,??????????????,?????????????,??,?????????????,??
?1996???????????,????????????????????,????,?????????????????????(??)
?????????:?????????