?? ?????????????????????
????:1???????????:???????
2???????
3?????????
4???????
5?????
2???????????????5??????????,?,???????????????????????
??????????,???????????????????2??4???8??????
???:??
2???????????????5??????????,?,???????????????????????
??????????,???????????????????2??4???8??????
???:??
????:1???????????:???????
2???????
3?????????
4???????
5?????
2???????????????5??????????,?,???????????????????????
??????????,???????????????????2??4???8??????
???:??