12??????????????????20??????????????,????????????,??????????????????,???

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

(??????????????? ???????????????? ??? ?????????????????? ??????????????????????)

??:???

“????600?????”_????

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

????:1?????600?????:???????

2??????????

3?????????

4???????

5???????

12??????????????????20??????????????,????????????,??????????????????,???

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

(??????????????? ???????????????? ??? ?????????????????? ??????????????????????)

??:???