2????????????12?????????????????,????,??????????????? “???”?
??“?”;???????????“????”;????????????“????”,????,?????????,??????“??????????????”?????
(????????? ???????????????)
???????????????????:????
????:????????10?20?8
?????????????????????
CBA?????????????????
???CBA????3???8???6???
???:??20???????????????
???????????????:????
???????:????48???????
????:????????????????
GIF-???????????????????
??:???????9????7???????
????????????10???????
???????:????48???????
??????????????3???
??-???????????????2-1??
??:?3???????????
???????????????:????
????3????????:???????
????!?3?????9.8?????????
??2?????????0.4%
??????????????:??????
??:??????????????
????????????????high?
??????????????:??????
??:??????????????
??GIF-???????????1??????