?????11?????????30?????????????????????? (?????????????? ??????????????????? ????)11????29?????????????????????????12???????????1????,“12.4”??????????“???????????????”??

????????????????,??,?????????????????????????????,???????????,????????????????????

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

???????????????,??????????????????,???

????????????????,??????????,??

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

???:??????? ??“????v”????

?? “??????????????”????

????:1?????v:????vx

2?????????

3?????????

4?????

5???????

?????11?????????30?????????????????????? (?????????????? ??????????????????? ????)11????29?????????????????????????12???????????1????,“12.4”??????????“???????????????”??

????????????????,??,?????????????????????????????,???????????,????????????????????

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

???????????????,??????????????????,???

????????????????,??????????,??

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

???:???????