?? ????????????2.54??? ???????
![](https://image.chezhanri.com/2019/1202/8ac527dd6dc212b1227a3e44501618b0.jpg)
????:1????????:200?????
2????????????
3??????
4?????
5????????????
???????????,???????????,??????????2.54????,??4.6%,???????,???????12%????,?????????????????1.83????,???????72%??????????????????“???????”?
(??? ????? ??????)
???????:?????????????