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onclick="Application.popupLogin()">激活權(quán)益</a>  </div> </li> <li id="qylj7gi" class="sep"></li> <li id="um2b1sz" class="p-20"> <a href="/help/article?id=55" class="menu-tit">幫助中心 </a> </li>  <li id="hs6dqjv" class="login-item"> <a class="top-login-item">登錄</a> <a class="top-register-item">注冊</a> </li> </ul> </div> </div> </div> <div id="ol2zxxs" class="crumbs g-cw"> <i class="iconw-fixed"></i> <span>當(dāng)前位置：</span>   <a href="/question?tree_type=category&xd=2&chid=3" class="pointer">初中數(shù)學(xué)</a> <span>/</span> <a href="javascript:;">單選題</a> </div> <div id="tcjudav" class="m-wrap g-cw cfx"> <div id="lll3r5j" class="w fl"> <div id="esdnjoy" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="xr4pido" class="question-block"> <div id="keaqtxc" class="q-mc"> <h1 class="q-tit"> 1. 對于y=ax<sup>2</sup>+bx+c，有以下四種說法，其中正確的是（　?。?/p> </h1> <div id="4csbnbg" class="exam-s"> <span id="0kzulop" class="op-item"><span id="ygf53jd" class="op-item-nut">A . </span><span id="2j0qy7y" class="op-item-meat">當(dāng)b=0時，二次函數(shù)是y=ax<sup>2</sup>+c</span></span> <span id="iszitsv" class="op-item"><span id="5vaingr" class="op-item-nut">B . </span><span id="lmrytz9" class="op-item-meat">當(dāng)c=0時，二次函數(shù)是y=ax<sup>2</sup>+bx</span></span> <span id="5n1veed" class="op-item"><span id="4s8bzbh" class="op-item-nut">C . </span><span id="vflzhgz" class="op-item-meat">當(dāng)a=0時，一次函數(shù)是y=bx+c</span></span> <span id="3fsixnj" class="op-item"><span id="x97apej" class="op-item-nut">D . </span><span id="qzji1wf" class="op-item-meat">以上說法都不對</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="jxt1580" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="vuc0xqi" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=1612868" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 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