12?27????,???23?????“??”??????,“??”????“???????????”???

????,???“????”????????????????“????”???????????????????“??????????”????????????????,???“?+??????????”????,???“?????????”???????????????????,???“??”??????(?? ??? ???? ???? ?????)

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

??“????vx”

?? “?”? ????“????”?????????????

????:1?????vx:???????????

2?????????

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

4???????

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

12?27????,???23?????“??”??????,“??”????“???????????”???

????,???“????”????????????????“????”???????????????????“??????????”????????????????,???“?+??????????”????,???“?????????”???????????????????,???“??”??????(?? ??? ???? ???? ?????)

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