?? ???????????? ???????????????
![](https://image.chezhanri.com/2020/0320/47c72e99b08991e457ba1ea8260f8764.jpg)
????:1???????????:?????????
2????????
3??????????
4??????????
5??????????
??????:???,???????????,????????????????????
????????,?1500?????????????,??????????????????,???????????????????????,???
??,?????,????????????????20%???????,????????????????????????????????????????????????????????,???????
???????????6000?????????????????,?3000?????????????,90??,??????,????????
???????????,???????????????????????????????????????????????,???????????????????????????27.6%,???????????????????????????????????82.1%?70.4%?63.9%??????????????????54.3%????????????,???????
????????????????,???????????????????,????????????,???,???
????????????????:????????????