??????1???????????????????????????????17???? ???????????????,??17???,?(????)????,????

????,??,?????

?????????????,?????“??”??????????“??????”?????????????????1701???,?“?????”?

???,????16????,?“???????”? ?????:?????????? ??“??????”

?? ?????????????? ?????????????

????:1???????:????????

2????????sn

3?????

4????????????

5????????498????

??????1???????????????????????????????17???? ???????????????,??17???,?(????)????,????

????,??,?????

?????????????,?????“??”??????????“??????”?????????????????1701???,?“?????”?

???,????16????,?“???????”? ?????:??????????