?? ??????????????? ?????????
![](https://image.chezhanri.com/2019/1121/a90d5d5b2c04ea15f6e4918a13973234.jpg)
????:1????????????:??????
2???????
3???????
4?????????
5???????????
???7???1??? ?????????,????????????6???????30?,??,?29?????????
???,???29??,???7???????????????????????????30?,??99%????????????,????56%???????
?????:?????????????????