?? ??:????????4.2?????????
![](http://n.sinaimg.cn/news/transform/200/w600h400/20181013/6toM-hmivixm5273073.jpg)
????:1??????:??????vx
2????????50?
3???????
4???????
5?????
2??14???????,???“??”?????????????????,??,????????????????????????2015??3000???4.2????,????????????????????,?????????????99.6%??,???????????(? ?????????)
??????????????????:???????