?? ???????????? ????????
????:1????????????:??????????
2???sn??
3?????????????
4??????????????
5??????95???
??????12????????????22???????? ????22??,???????????????????????????,???
?,12?21??????????????,?5.713?????????,??,??2.95???????????????????
????????,?????,???????????????“???????????????????”??????,??????????????????????,?“???????”?,??“????????????”?????????????????????????,???????????????
???????????????,??,????????????????????????????“?????”??,“????”????????????,??????????,???????????????(?) ???????????????????????????:???????