?? ???:99.9%??????????????????
![](https://image.chezhanri.com/2019/0807/20190807120839943.jpg)
????:1????1000???????:????
2????????
3????????
4?600?2??????????
5?????????????
????????????9??10? (????? ???????????)???????(???)10?,????99.9%?????????????????,?????9???????23????????????????????????????
????????????????,??????????????9????????????23??“?????”?,????????????,??????????????????????????4?????????????????????????
?????????????,?????????,?99.9%???????????,??9???23??,??????????????????????????0.1%?
????????????,??,?????,????????????????????????????,????,?????????????(????) ??????:????