?? ?????“????20??” ?12????
![](https://image.chezhanri.com/2019/0626/20190626151653918.jpg)
????:1????????:?????vx
2????????
3??????
4???????????
5??????????
????7?????????5???? (???? ???)??????????5?????????????????,«???????????????»(???????????????????????????«???????????»)???,????,?????????12???????
?«??»?????20??,?????????????????????,???,????????????,????
????,«????????????»????,???,????1??????(??,?????)????????,???100??,?????????????????????????????????????????????????????
????,«?????»??,????????????,?????????????5??????????????????100???????????????(??????????),???????2%??????;????100??????,???????????5%?????
????12????????????????????,??????????:????????????????????????????????????????????????????????(?????????) ?????:??????????