?? ??????????? ???????12?
????:1??????????:????vx
2?????????
3????????????
4???????????
5????????
??????11?30????? (?????????????????? ??)11?30??,?,???,????????????????30??????????????,12????1?3??,?????????,??????12??
30?,?,?,??11???????30??????12?1??,?????????????12?????????????????1?2??????????????
?????????,????10??,???????????????????20???????????,?????
??,????????,?????
????,12?1??????????3????,??????4????????????6?,???????????????,??????????????????????8??10?,???????????12?????????4???????6?,???????????7?8?????,?????????9???????
?,??????????,????,11??30?12????????????2?,?????????????????,?????
12??2?5?,????????????,?????????????????????????
??????,??????????,???????????,???????????,?????????????????????????????,???????,??,?,????????,?,??,?????(??????????) ?????????:?????????????