????:1??????????:??????????

2?????90????????

3???????

4?????vx

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

??2?14?? (??????????????????????????? ??????????)???14????????????

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

??????????:14??????????????«????????»??????????75??,?????????????????????,???

??:??????,??????????,????????,???????????,??????????????????,??????

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

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