????12??????4????????????????? ???????????????,???4??,????,???????,???

??????12???????3??????,????3??????????,???????????,??????,????????
????,???“???????”,????“??????”??????,????,????????????????????????????????? ????12??????3????????????????,????????????????????3???????,????????????,????????????????,????? ???????,??????????“????”,?“???”????????,????,??????????????????????

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

????????????????,????3??????????,???????????????“????????????”,????????“????”?

????4????????,????,??

????????????????:?? “?????????”_????

?? ?????:????????,??????

????:1??????????:???????

2????????

3??????????

4?????vx

5?????????

????12??????4????????????????? ???????????????,???4??,????,???????,???

??????12???????3??????,????3??????????,???????????,??????,????????
????,???“???????”,????“??????”??????,????,????????????????????????????????? ????12??????3????????????????,????????????????????3???????,????????????,????????????????,????? ???????,??????????“????”,?“???”????????,????,??????????????????????

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

????????????????,????3??????????,???????????????“????????????”,????????“????”?

????4????????,????,??

????????????????:??