?? ??????????“?????????”????
????:1????????:sn???????
2???????
3????????
4??????????
5????????
????11??22??? (??????????? ???)11????????22?,?,????????,??????,?????????????
????,??????“??????????”??,???????????,?????????????????????????,?????????????????,?????????????????????,???????????????
???????,????????????(??????????????????????????)??????????????????,????,????????????,????????????????????,??
????????????,???2.8????,????0.6???????????????,???????????????????????????????????????????,???10926.4???????????????????,?????????????3000???????????????????,????????1?????????,??????50%???230???,?50%?70%,??700????????????????????????????????,????????,????????2000????,??????????380??,??????????120??
??,??,?????????????,?,?????????????“????”????
???????????,??,???????????????????????,???,??????????,????,????,?????????????(?????????????????) ???:?????????