10。
???????é???2???????????????-???????????????è|???1????o???????
?¥????????????ˉ????|???1è?ˉ??¨?°′é?¢?????????
è·ˉè¥?è?????èo????èμ·?????????è??è·??o???a?2???????
????????ˉ???è???????1è????-????|????????????a?°±??ˉ??3?o?????????¨??????èˉ???????
???????¤§?ˉ??1?????¥?è′oèˉ????????°?é????|??????????¨??3??????§??????
è§¥?-1?o¤é???????′??-?????????????????′???????¥??????¨????????ˉ?o2??μ????????¨è????????è????????
è?°è???????¥?????¢???é£??????±??????????????§???èˉ????????o?????1????
????¤?????¥????????????ˉ???è·ˉè¥?è??è???2???¥???????????£?°????
???ˉ????????????
????????????o?o?è?¢????????????????????????
????1???????
???????????????è·ˉè¥?è????|èo????????o?????¤′????????a???????£°????????o?????¨?o???????
????1±???????????3?3??|?é?¨?????¥????????o???
??????????o???????èμ·?????o????????°é?£???è°??????????é???-?é????¥??????è????????
è???§?。。。。。。??????????????¢è???????????
é¥-???????????¨???é??????1?????????-???èμ·???a?????èˉ′????2?é??????????????è|?è???????°????′??o???????????ˉ1è±?é?????????o??????¥???a??
?¥??????1????¨3????????¥????????a????????′?o???a??£?-????