11???????????23????????,?,??????????

?????????????????,???,??,???,?????“??”,????????????????,?????????????????????????,??????????????????,???,??,?????????????????????????????????????????“??????”????,?????????,????,???,????????????????????????(???????????????????????? ?? ????)

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

“????”_????

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

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

2???????????????

3?????vx

4?????

5??????

11???????????23????????,?,??????????

?????????????????,???,??,???,?????“??”,????????????????,?????????????????????????,??????????????????,???,??,?????????????????????????????????????????“??????”????,?????????,????,???,????????????????????????(???????????????????????? ?? ????)

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