?? ??????????????????????
![](https://image.chezhanri.com/2019/0522/20190522113434409.png)
????:1??????????:??????????
2??????
3?????95???
4????????
5???????
??????6????????????28?????? ??????????????:????,????,??????????????????????????(PPP)?????
??????,??????PPP???????????,?????????,?????????????????,??,???????????????????????????????????,???????????,??????????,????;???,????????????????????;???????????,??????????;?????????????????????????????????????,????????????,??????;??;???????????????????PPP????????,??????
???,??????????????????????????????????????????«??»«???????????»«????????????»?????,??,???????????;????,??????????????????;?????????????????????,????????????????????????? ?????????????????:????????????