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<div id="4xixh9p" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5282876.shtml" class="ques-origin a-pointer" target="_blank"> (2024高二下·恩施月考) </a> 如圖所示，是一個(gè)半徑為R的中國(guó)古代八卦圖，中央S部分是兩個(gè)半圓，練功人從A點(diǎn)出發(fā)沿曲線ABCOAD行進(jìn)（路徑如圖實(shí)線所示），當(dāng)他走到D點(diǎn)時(shí)共用時(shí)為t，則該過(guò)程練功人的平均速度大小為（　?。?p><img width="149" height="147" src="http://tikupic.21cnjy.com/2024/04/06/d2/5c/d25c5d8a2236fa6cf18dfb6001bb6fee.png" style="max-width:100%;"></p> </h1> <div id="ayzrtuj" class="exam-s"> <span id="pzcgy8b" class="op-item"><span id="yponhtp" class="op-item-nut">A . </span><span id="y4byq4h" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmtext%3E%CF%80%3C%2Fmtext%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmi%3Et%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="b9ryzon" class="op-item"><span id="mfukx9a" class="op-item-nut">B . </span><span id="wyyjclp" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmn%3E5%3C%2Fmn%3E%3Cmtext%3E%CF%80%3C%2Fmtext%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmi%3Et%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="kiptpqj" class="op-item"><span id="uprgdxt" class="op-item-nut">C . </span><span id="xpovrsg" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmi%3Et%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="idvdmby" class="op-item"><span id="dlrkk9x" class="op-item-nut">D . </span><span id="thsorg4" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3Et%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="h9evawa" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="4bwotlb" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=56249719" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 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