?? ??:?????“???”???? ????20?
![](https://image.chezhanri.com/2019/1217/987193843dc00234ec71e536e1d35f62.jpg)
????:1??????????:?????????
2??????????
3??????
4???????
5??????
7??????????????9??,?????????????,???????????????????,?80?,????45????????,?80%,???????????????????????60%?????,??30???140??,??????????30??,???20????????7?9????,?,???? ?
7?????9??,??,??????????????????????????????,????????80????,??????45????????,???80%,???60%???,????????30?????140??????????????,??30??,??????20??????????????????????7????9???,?????????(????)?????? ???????
7????9???????????????????????,????,???????????????????????,???????80??,?45?????????????,??????????????80%,??60%???,???????????????????????30????????140????,??????????????30???,?20????????????????????????7????????9??????????????,??????????????,?????????U???????????????? ???
7??9????,???????????????????????,????????????????????????????????,??????????????80??????????????,??45???????????????????????,???????80%,??60%???,???????30???????????????????140??,??????30??????,??????20????????7??????????9??????,????????,??????????? ????
7??9?,??????,?????????????,??????80??,????????45??,??80%,??????60%?????,??????30??140???????,????30?,??20???7??9??????????????,??,???????? ????????
???????????????:??