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

????????,???????????,???????,????“??????”????????,????4????????????????????:??“????”?????????????“??????”??;???????????????????;???????????;????????

?????:??????????????? “??????????”????

?? ??????:“??????????????”????,???

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

2???????

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

4????????

5????????vx

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

????????,???????????,???????,????“??????”????????,????4????????????????????:??“????”?????????????“??????”??;???????????????????;???????????;????????

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