? ??????????5.4??????

????:??????:????sn??

?11??????????22?? ??,?22?,?????5.4???????,????“??”?

?????,?22?????18??45??20?22??20???????????40???20??43???21??????????29?,?20??40???????5.4?,??????????23.2??????120.18??,??????????23.2?????,??????????7.7??????????

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

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

???,22??????????20???????40?4.7??????(?) ??:?????????????