?? ??????????????????????
![](https://image.chezhanri.com/2019/0530/20190530174610270.jpg)
????:1?????:????????
2?????????
3???????
4?95?98??????
5??????????
??????6????28????????? ?????????????????????:?????????,??????????,?????????????????????????(PPP)?????
?,??????PPP??,???????????????????????,???????????,???,?????????????????????????????,???????????,?????,????????????;???,?????????????????????????????????;????????,????????????????????????????;????????????????????,????????????,??????;????;??????????????????????PPP???????????,???????????????
???????????,????????????????????????????????????«??»«???????»«??????»???,??????????????,??;???????????,???????????;???????????????????,??? ???????????:?????????????????