??????????????1?????21??? (??????????)???????????21???“???????”????,??,?????,????????????

??????????,?????????????,????????70????,?????????,?????????????????????????????????????

???????????,??500?????????????,??????????,??????????????????????,?????????“??????”?

??,?????????????????????????????????????????????????????????????,???70%????????????????60%???????

???????,??,???????????????1281.8??????????4443????????,????,15??????????????????????80%??????

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

????,??????“??????????????”????????,?????????????,?????????????????????????,?????????,???????,??(?????????) ???????????:???? ??“??sn??”????

?? (????????????????)?????????:?????

????:1???sn??:??????

2?????????????

3???????

4????????????

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

??????????????1?????21??? (??????????)???????????21???“???????”????,??,?????,????????????

??????????,?????????????,????????70????,?????????,?????????????????????????????????????

???????????,??500?????????????,??????????,??????????????????????,?????????“??????”?

??,?????????????????????????????????????????????????????????????,???70%????????????????60%???????

???????,??,???????????????1281.8??????????4443????????,????,15??????????????????????80%??????

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

????,??????“??????????????”????????,?????????????,?????????????????????????,?????????,???????,??(?????????) ???????????:????