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

2?????????

3????????

4?400?3???????

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

????????2??????6???? (????????????)?????????????6??,???,?????4.36??????????,???5600??????????,?????“?????????”?????

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

??????????????,???,?????????????????3%???????????,????????????????????????????????????????

??????,?????????,??,??????????????????????????????????????????,???,?,????????????1000????19.4%?(???) ???:??????????????