?? ?????????????????
????:1????sn??:???????????
2?????28??
3???????
4??????????
5?????
???12???????????????????????????27????????????????,????,????(?)
???:???????????12???????????????????????????27????????????????,????,????(?)
???:????????????:1????sn??:???????????
2?????28??
3???????
4??????????
5?????
???12???????????????????????????27????????????????,????,????(?)
???:????????