?? 2????????????????????
![](http://n.sinaimg.cn/news/transform/200/w600h400/20190323/IZks-huqrnap3578690.jpg)
????:1????600??????:???????
2?????v
3??????????
4??????????
5??????
???????2??????15????????????????? (????????????? ????????????)????15???????,2???????????????????????????,??,??????????
???????,???????????????,????????????????,??2?(2?????????????????16??????????28??)????????????????????
??,2???????,??????????????????????????????????????,??????????????,????????????????????????????,???????????????????????????????????????????????,?????????????????
2??????????,?????,??????,??,???????,????????????,???
??????????????,2????????????????,?,?????????,????????????????,?,????????????????????,?????????,??????,?????2??????,????,???????(????) ??:???