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

?????????9???????4????????????????? (???? ????????????)????????????????????4?,20?????????????????

????????,????????,????,????,????(??)???????????????,???????,?????

?,??????????????????????????????????????,???????????????????,?????“???????????”,??“???”??,???????????(???????????????????????) ??????????????:????????? ??“??sn??”????

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

????:1???sn??:??????????

2???600??

3????????

4???????

5??????

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

?????????9???????4????????????????? (???? ????????????)????????????????????4?,20?????????????????

????????,????????,????,????,????(??)???????????????,???????,?????

?,??????????????????????????????????????,???????????????????,?????“???????????”,??“???”??,???????????(???????????????????????) ??????????????:?????????