?? ?????????????????
![](https://image.chezhanri.com/2019/1128/36e47f2ffcc0c94fe4d58930c428aa9c.jpg)
????:1??????????????:???????
2???????????
3?????????
4???98?
5???????
??????????8??22??????????????????? (???????? ??)8????????22?????????????????????????????,?,????????????????
??????????????????(????)?????????????????????????????????????????????????????????????????????????????
???,????????????????????,??????????????????????????????????????????????,???????????????????0.0001%0.02%?????,????,????
??????,???,???????????????,?????????????,?,?,????????????????????????1000???????,??,?????????????????????????????
?????????,?????????????1??????????????5176???????(?????????????5.1%7.6%)???????,1??5176???,???????100????500?????,??????50???????
?,??,????????600???????????????????????????200?????,???????????????,???????????????????,?????????????????;????,????????????
?????????????????,????????????????????????
?????,?????????????????????????????,????????????????????????????????????????????,????????,???????(?????) ???????????????????????:??????????