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

2???????

3???sn??

4???????

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

?????????????????11??????????????????????28?????????? (? ?)??,???????????????

???????????????????????“?????”???????,???1?,??,??6000???

????????????????

?????????????,??????????????????????????1260?????,???????20??,????1206???,??6000?????????,????????2000????,???????13???????????

??????????????????1700??,????,??????,???“???????????????+????????+????????”?????????????,???????????????????1000???????,???

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

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

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

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

????????:???