?? “?????????”???????????
????:1????????:???????
2???????????
3?????vx
4???????????
5??????????
???12????4? (????????????????????? ????? ??)12??4?????,????,???????????“????????????????????”?????????,?????????
??,????????“????????????”????????????,??????????,??????????????,????????????????????????????????????,??????????,????????????????????,???????????????“?”,????????????
“??????????”???4??????????????????? ????????????????,“??--????”?????????40??????????????,??1?????????????????????2????????,?????????????????????????????????;???????????????????,???,?????????????????????????????????????????????4???,???,????12??????????????????(?????)
????:???????????????????????????