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

2?????????

3?????

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

5???????300?500

??12????2? ???????,????????,???????

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

????,??????????????????????????????????????????????????

?????11??????30?????????????????????,???11?????????????,?????12????1?2??,??,???4??????,??????????,???

???????????????,?????????????????????????,???????????,???????????????????,??????????????????????????????11?????29???30?????????,????????200???

???:?????