?? ????????????????????:???
????:1?????????:?????
2???????????
3?????????
4??????V
5?????sn
??????????????12?????????11?? (????? ???????)????????????????????12?11???
?? ?? ????????????????????:????????????????????,????????,?????????,???????????????????????
???????:???????????????????????????,??“??”?,??????????
??,?????????????????,????????(??????????)
?????????:????