??10????????30????????? ????????30??????????,??:?????“??”??????㵢????“?????????”???????????????,????,????????,????????????????

?,??????????,??????????,?“????”?????????????,??6470???????,??;????“??????”,??40??????????,???“??”,?????“???”;????????????,?????????……?????,??“????”?????????????????,???????

??????????,??????????????????“???????????????????”?????????,?????,??,??????????“???”???????????,?????????“??????”,?????“??”???????????? ?????:?? “??????????”_????

?? ???????????:????“???????”???

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

2?????vx

3????????????

4???????????

5???????????

??10????????30????????? ????????30??????????,??:?????“??”??????㵢????“?????????”???????????????,????,????????,????????????????

?,??????????,??????????,?“????”?????????????,??6470???????,??;????“??????”,??40??????????,???“??”,?????“???”;????????????,?????????……?????,??“????”?????????????????,???????

??????????,??????????????????“???????????????????”?????????,?????,??,??????????“???”???????????,?????????“??????”,?????“??”???????????? ?????:??