?? ??????“?????????” ???
![](http://n.sinaimg.cn/news/transform/200/w600h400/20190107/JXWc-hrfcctn4352682.jpg)
????:1???????????:??????
2???????????98?
3????????
4?????vx
5???????v
????????????2????????????18?? (?????? ?)???18???,????,??“???”,??????????????,??????“?????????????????????”?,??,???
???????????????“????????????”?????,???????????????????????????,??,????????50?????????????(???)????????,??????????500???????????,???????????????1-3?????,????????0.3%-0.5%/?????,?????????,???,???????,??,??????
??,“???????????”??????????????????????????????????????????????,??????????????,?????????,?????20?????????????(???)?0.3%/??,20???0.5%/???????????????????????????????????????????????????????
???,????????“?????”??20????????????????(???????????????)????????,????20??????????????????,??????????????????????????????????,????????????????????????????(????????) ?????:?????????