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

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

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

4????????

5????????

??,??????????????????????,???“???????”?????“??????????”??5??????????????????

?????????????:?????“?????????”???!??????:??????????

????,??????,????,???,??????????,???,??,????500?297????,????????????????????????,?,?????,?????????“???????”,??????“???????????????”???????,?,?????

????????,?????,??????????????“?????”???????,??????,???????????“??????????????????”????????????????249.5???????,????????????,??

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

???

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

????

?

?????

(????????) ??????:???