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

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

3????????600

4???????

5?100??????

?,?????????1??,??500?????????????????,?????????????????,??????253????????

????????????,???????????,10????????????,??????????????

???????? ??????????:???,???????????????????,???????????

??,??,???8000??,???????????1000???????????????

?? ???????????????:????????????1???,???????????3.3??,?????????????????,?????????,????? ???:?????????????