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

2???????

3?51?????

4??????

5????????vx

???6???17????????????? ??????????,??,?(17????????????)??7??????????????,????????????,??????????????????????,???

??????????????,???17???????4??????????,?,???,?????????????????,??????????,??????????????????????

??????????????,???????????????????????,???????,??????????,???

?????????????,17????????????????4???????,?????????????,???????????,?????????,??????????????????????,??????????????????????????????????????5??10?,???,??,???????????

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