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class="exam-s"> <span id="y96p71d" class="op-item"><span id="2ecceii" class="op-item-nut">A . </span><span id="gac2jdt" class="op-item-meat">0.1×10<sup>﹣</sup><sup>7</sup></span></span> <span id="2emi6or" class="op-item"><span id="jc7vkko" class="op-item-nut">B . </span><span id="ufmtk7f" class="op-item-meat">1×10<sup>﹣</sup><sup>8</sup></span></span> <span id="iw2l7ys" class="op-item"><span id="bfn7jey" class="op-item-nut">C . </span><span id="x7rbix7" class="op-item-meat">1×10<sup>﹣</sup><sup>7</sup></span></span> <span id="avypap2" class="op-item"><span id="e7og7rl" class="op-item-nut">D . </span><span id="bb67igl" class="op-item-meat">0.1×10<sup>﹣</sup><sup>8</sup></span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="dm8te77" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="wmnytdd" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img 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