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g-cw cfx"> <div id="7fjfitf" class="w fl"> <div id="temfpvi" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="bulz1tr" class="question-block"> <div id="no2dpuh" class="q-mc"> <h1 class="q-tit"> 1. 用反證法證明“三角形中至少有一個角不小于60°”，應該先假設這個三角形中（　?。?br></p><p><br></p> </h1> <div id="bwcexdq" class="exam-s"> <span id="f1pssoa" class="op-item"><span id="1lrtfbg" class="op-item-nut">A . </span><span id="xrhqbod" class="op-item-meat">沒有一個內(nèi)角小于60° </span></span> <span id="lwxr3u8" class="op-item"><span id="835xsoc" class="op-item-nut">B . </span><span id="wv89tsi" class="op-item-meat">每一個內(nèi)角小于60°</span></span> <span id="bd2w77a" class="op-item"><span id="ccr7rpf" class="op-item-nut">C . </span><span id="o5l3vrg" class="op-item-meat">至多有一個內(nèi)角不小于60° </span></span> <span id="i75qbfe" class="op-item"><span id="vomxp5k" class="op-item-nut">D . </span><span id="zzfbd2e" class="op-item-meat">每一個內(nèi)角都大于60°</span></span> </div> </div> </div> </li> </ul> <div 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