?? ??????????????? ?????????
????:1???????:????
2?????vx
3???????
4???????
5???????
???,????12??18????????????????????,???????????,????“?????????”???,???????“????”,??
??????“?”????4300????????????????,????153??????????,??????????????????????????3000?????????????????
??,???,????40???23?????????????,??20%????????????????????????????????????????????,?????100??????150???“21???”,???“??????????”??????????,????????????????“???”????(?????????? ?? ???????????? ??????????? ??)
???????????:????