?? ????12??????????? ????????????????
????:1?????????:????300?3????
2????????
3?????vx
4????????
5?????
???????????????????????????9??????????19???????? (???? ???????????)???????19???????????
????????????:??????9????????????????18??,????????????????????????????????????????10???124?????????14????????????43???????,?????????12??????????,????????????,???????????????????????,??????????
????????????:???????,???????????????????,?,?????
????????????????????4??,?????????????????4?,??????????????,????????????????,??,?????????????,????
????????,????????????????????????“???”????????????????????,??,???????????????????????????,?????????????????????????????????????????,??????????????,?????????????,?????????????????????????(???) ???????:????????