?? “??”???????“???” ??????“15???”
????:1?????:???????
2?????????
3?????SN
4?????600
5?????????
??????????????????12?????20????? (???? ??????)????20??????,???????????????,???29???,????1.81??????????;987??????????????,??1.8??????????
???,???????????????,??“??????????????????????????”?,??????????????????,??????(??????????)?????????????,????????????“???”???
12??????????????20???,????,????????????? ??????????“15????????”??,???????????????3????,???????“1+1+N”??,???????“1”??+“1”?+“N”?,?????????????“???”,????“????????+??????”???,??????????
????????????????,????“????????”????“?????????????????????”??,????????????????????????,??????????????????????????,????“????,????????????????;????????,???????????;???,??;???,????????”,????????????
?,“??????????????”?,???(???)??????????,????????,?????????????11?3?,???????212???,??715???,??????????????????1002?,???????99?????????,?288??????,?1797??(??)
????????????????:???