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

????:??????SN????:???????????

????????????????????2??????????11??? ?????????11?,?????????,??

2????????1??????????????????2???????????????????????????????5???????,?,????46?????103??????????????,???????????????????,?????????????????????????5?????

??????,?????B?????????,?????C??????????????,????A?????11??????????????????????????1???????????????3??3?????????

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