?? ? ?????????????????18??
![](https://image.chezhanri.com/2020/0430/be8219b3712c7f65a11d582944b2dc22.jpg)
????:1?????:????????12????
2???????
3???????
4????????????
5?????????
???????,?,??????????,???2.4??,????????????????????,??????????,???
6???????????????4??40????,???????,????????????????18??????,???????,?????????????
?????????,?,???????????????
(???????? ??) ??????:??