?? ??????“?VA”??????3V3?? ??
![](https://image.chezhanri.com/2019/1220/ba6f2f528c057496012246bb45d05551.jpg)
????:1?????????:??????
2????????
3???????????
4?????
5?????????
??????????8??17????,????????????????????“?????VA”3V3???
???,?????????????????????????????????,???????????,???,???,???,???????
?,?????????????,????,???,??“????????????????”“?”?(?????????????????? ??????????? ??????????????)
??:?????