?? ????????????????? ??????????????
????:1???????:??????
2?????
3????????sn
4?????????????
5???????????
?1?8? ???,1??????????????7?????22??????,????????????,??,???????????????????????????????????????(????????????)?4300?????(??),?,???3??50?,??????????????????????????????????????,??????????????????????200???????????,?1????
???4600??(??)???8???1????????????,????????????????????????
???????????:??????????