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

2?????SN????

3????95?

4???????

5?????????????

??????????9?12??????? (??????? ????????????)?????9.2????????,??75??,??????????????????,?,???????????,?????????????????,?????????????????

???12??“?????????75???????”????????

???????????,??,?????14??,?????????300-500??,??????????,??????????????????????,???????????????????????????????????????????

???????????,?????????????????????,???????????????????????????????????????????200???????????????,?????????,????50%?????????????80%?

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

??????????,??,?????????????????,?????“???????????”?????,?????????????????,?????,????????????????????????????????????????????????????????????,????,??????????????????????????,????????????????????????????????

????????32?????????,????“????????????”????,??,?????,??50??????

??????????4????????4?????,??160???????,80%????????3????,???????????4??????,???(????????) ?????????????????:???????????