?? ????????????????????
![](https://image.chezhanri.com/2020/0320/1d28825b1db1972c1a12c514aef49c67.jpg)
????:1????????:??????
2???????????
3???????24?????
4???????
5??????
??????????????????????6???????????????????????21??? (????? ??)???????????,??????????????,??,??????????????????????
??????????????21???«?????»,???????????????????????????????
??????????????,?????????????????????????????????????,???;????(?????????????????)??;???????;??????????????????????;????????????????????????;?????????????
??????????????????,??????????????????????????;????,???????,????????????????????;???????????????????,????????????????????;?????????????????????????,??????????;????????????????;????????,???????????(?????????????????????????) ????????????????:??