?? ??????????????????????
![](https://image.chezhanri.com/2020/0326/1569579ed453fdd50b15217dd9288b57.jpeg)
????:1?????vx:???????????
2???????????
3??????????
4??????
5????????
????6??????????28???????????????????????????? ???????:????????,??????????,???????????????????(PPP)???????
????????????????,??PPP????????????,????????,??,????,???????????????,???????????,?????????,???;???????????,?????????????????;???????????,??????????????????????;???????????????????????????????????????,??,??????????????;?????;?????????????????????PPP???????????????????????????,???????????????????
???,????????????????????????«???????????»«???»«???????????»??????,???????????,??;????,????????????????;??????????????????????,??????????? ???????:?????????????