?? ???4.2??????????
![](https://image.chezhanri.com/2020/0407/c985e647812cc12b8c4553608450a679.jpg)
????:1?????????:????????
2?????vx?
3???????
4???????????
5?????
?6?????16? (? ???)?,??16?????????????19????16??(??18??????????????16?????????????),????????4.2?????????
??,????????35.8???140.1???,??70?,?????2?
????????,???????????(??????????)
?????????:??