第7章（第2页）

请退出浏览器阅读模式，否则将导致章节内容缺失及无法阅读下一章。

????′??2?é?￠???è?¨?????°????¤????????????ˉ??????????-±?????ˉ????-±????????????????????????????1??????±?????????

è????￥èˉ??????ˉ???????o?????-±?′????

????§????????????o??ˉ???é????¨???????-±?′??°??￥1?????¨?????????è???¤?è?°???????1?é??????o?è????￥???

?????-????1???§??§???èˉ?èˉ-????1??????¨???????????¨?±??¤????

????′??2??2?????????????

?￥1è????????????°±????o???′??′????¤????

é????????é????2???????￥1????o??????????é?′????????1???

è???????¤??a?°????????°?????±??°±?????-?o????

?￥1è??è???????¨??????????o?????????ˉ???a???1???1??????????o????a??

??¨??????é???o??????a?°?????????????a????ˉ??????????o?????????°???????????°?o????????2???￥???a??

????′??2???ˉ?o???ˉ??′è§??????¨????o?????￡°????-????

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

?ˉ?????￥1?-?è??????¤?????·2????-??o?????1??o????

??1?°??°?????¤?é?￠èμ°è??????￠????a????????é???¤?????12????o????è?????????1?è|???|èμ°?????????a??

????′??2????????????o?￡3????°??????′é??èo???o??|????????¨???????¤§?-|???????????§????????o??￥?????¨?o?????-???????

a???2??o????èμ°??§???a??

a?|a?|

???????1???1???

é???|???¨???????????￥??￥?????????????′??2???????è???¤???￥??°?°?????±????

??¨??????è§????????·±?·±??±èμ·??????a??????°±????￥??￠ˉ???????????￥???è?3?o????è???¤???????a??

????′??2???????é???????o??·??￡????????????èˉ?????2????????-???????

??a???????·??·?é?????a??è???????§???a??

请退出浏览器阅读模式，否则将导致章节内容缺失及无法阅读下一章。