?? ??? ???6??6?????????????
![](https://image.chezhanri.com/2019/0228/20190228165253524.jpg)
????:1???????????:?????????
2?????
3?????????
4???????
5???????500?4???
???????7???????23????? ??,???21????????????????????,???????????6????6????????,??????
????????????????(HRT)??????,??75??????,????
?????,??,??????????5????,?????????5??????,1??????????????????????,???6?????????????,??4?????????????????
?,???,?????????????????????????????
???????????????????“????????”,???????? ???:????????????