?? ???????????????????????????????
![](http://n.sinaimg.cn/translate-11/700/w900h600/20180422/F5DL-fznefkh6166479.jpg)
????:1?????????????:??????
2?????????
3???????
4???????????
5???????
???????2???????????????12????? ??????????,?????????????????????,????????,??,???????????????????????????????,??????????
??,????????????????????,???????????????:????????,???????????????????,???????????????,????????????,?????????????,?????????????????????????????????????,??????????????,????????,?????,???
???????????:?????????????????????????