?? ?????????????????
![](https://image.chezhanri.com/2019/1120/dd0281ca86bc6910fb918d61205a607b.jpg)
????:1????????:??????
2??????????????
3???????
4???????
5??????????
??????????????????????(????????????)?????????????????,??????????????????????-?????,???????????1000??????????????,??????????????????????????,?????????????
???,??,?????????????????????1Kb???????????????,???10???????????????????????????,???????????????«??????????»?????????????????«???????????????????»?
???????????????,??????????????????????,???????????????????,????????,??????????????????????????,?????????????1Kb??,??????????????????????????????98%,?????????????????????????89.5%???
??,?????,????,??????????????8?????????????,??????????????,??????????(??15??)?????,??????????????20?????????????10?????????????????????????????? ???:???????????????????