?? ??????:??????????600??
????:1???????????????:???????
2???????????
3?????????
4????????????
5???????????
?? ???????????????? ??????? ??????????
??????????4000???? ??????????“C??”
????????????????:?????????????????
???? 1/512?????????8????,???(?),???????????3.1?,??????????????????5000??????/??,????600??????????,????????85%?????,????90%??????
???:?????
???? ??????