2?7??,????????????????????????????????A???,???????????,??????500???????????

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

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

“??????200????”????

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

????:1???????200????:????????v

2?????????

3????????

4????????

5?????

2?7??,????????????????????????????????A???,???????????,??????500???????????

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

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