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

2????????

3?????VX

4????????

5?????

?9????22?????,???????????????????????,?????????????????21?????????

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

??????????????????????,???????????50%???,??????????

???38?,?????????????????

??????????????7?,????????????????????11?????????????17????????????????????????????????,????????1????????2??????9??????21?7???,??????????????????(???? ??)

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