????:1????????:????kb??

2???????

3?????????

4??????50??

5?????????

????1??????????????????????20? (? ??)???????A?20???????????????(?)?????????,?????????????,????????,??,????????“????”?

?????????????,??3244???????????,??0.08%;?????????????????????10256?,?0.94%;????2104???????????,?1.81%?

?????,????????????????????????????A???????????????,?????????????,?,????????????

????????,???????????,??????,????????,???????????????????,?????????????,???

?????????????????????????,?????????,????????????????????2.4%?2.31%??1.83%,??????????,????????????????????????????????????10%?(???) ????????????????????:??