?? ?????????????????????
????:1??????:??????
2??????????
3??????
4???????
5?????????????
?12???27????????????? ??????????,12??????????????????????27???,????????????????12???????????????????????,???,?,??,??????????????
??:????12???27????????????? ??????????,12??????????????????????27???,????????????????12???????????????????????,???,?,??,??????????????
??:???????:1??????:??????
2??????????
3??????
4???????
5?????????????
?12???27????????????? ??????????,12??????????????????????27???,????????????????12???????????????????????,???,?,??,??????????????
??:???