2?7?,???????????????????????????????????500??1000?????1500??
??1500???????,?????,?????????????????????2?????????????16????538??,?????????
???????????????,?????????:“?,??,?,????????????”????????,??
(?? ?? ????????)
????????????:????????????
????????????10???????
???CBA????3???8???6???
??????????????????
????:???????????????
4?10??????????10????13?
??????????????:??????
???:??????????????????
??GIF-???????????1??????
??????:?????????????
????:???????????????
?????!???????????
????!?3?????9.8?????????
???????????????????(?)
???????????????:????
????:????????????????
???:??????????????????
????????!???????????
??:????“???”?????????
??:??????????????
????“??”A???????????????
?????????????:???????????
??-4???????????1-2??????
GIF-??????????????????
??2?????????0.4%
??1???2?!??????????????