?? ??????:? ???????500???????????
????:1?????????:???????
2???????????
3??????
4??????????
5????????
?? ?????????1??????30??18????:
?????????,30?????????31??,??????????????1???????????????,????????????,????????500?????
?????:
1?????,??,?????
2?????????????????????????????,?????????
3???????????,??????????????????,????????,?????????,??????
?????:??????