?? ?????????????????????????
????:1????????:??sn??
2???95???
3????98?
4??????
5???????
?????????????????????1??2??????????????? ??????????,???,??????,?????????
????,????????,????????????????,???????,???;??,????????????????????;?????????????,???????????????,????????????????,???????????
???????????????????????????,?????????????????????,???????????,?????????,???,??????????????????????????«???????????»«????????????»«??????????»?????,????,????;?????????????;??????,????????????
???:???