第(1/2)节     ?????????§???????±?????o???????????????????á??x???????????????áá???±????????6?????§????x??????÷??°à±?·?????6xé??????áá??3?ê????????????????????°???6xé??·?????????6?????§???????÷xé??xé?¤?????????????°???u??x?áá??????6??xé?¤x?????±?xé????????x?????xé?±?????°????????xé??????°??????????u??????±i?????????????????????????i°??????o?¨?????o???±?i????????????

    ??????x??o???????o????x??????????????????????????o?????i??x?????????????·????ê???????u???????÷°à???§?°??°à?÷???????÷?é????x???°à?????????i??????x???????·?°à???¤?????????÷??°à?????i????x???±??????????á?????u?????????à?÷°à??xé?¤?????i????????x???????x?????áá??????????????·?????????????????x???????x?±???????

    ???????u?????????i????????x?°?????°?°????????ê?u???????o?§±????u???o????????·?????????????±????????????????÷????????áá???????§?u?????????????????????????÷????????????????x??o?u?o??????°?????????????·?x??????u?????????u????°?°??????????????u???????u?????±?o????????????x????????°???±??áá?????????o???à????????????????????x????°???±??????x??????????????o??5?ê????????

    ???u???????????uáá??±????????????????????o?????????????o???????÷???á???????°???????¤?????????????????????u?u???±?o???????÷°à°????u???????o?????????ê??????????°?°??????????????????·?i???????????????????o??????·?????????????????????°à???????
第(1/2)节