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<span>當(dāng)前位置：</span>   <a href="/question?tree_type=category&xd=3&chid=6" class="pointer">高中物理</a> <span>/</span> <a href="javascript:;">單選題</a> </div> <div id="ini8lxz" class="m-wrap g-cw cfx"> <div id="miiub8y" class="w fl"> <div id="iehr2t0" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="iyljih8" class="question-block"> <div id="c8xspwr" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5196691.shtml" class="ques-origin a-pointer" target="_blank"> (2023高一下·黑龍江期末) </a> 有一質(zhì)量為<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Em%3C%2Fmi%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的木塊，從半徑為<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Er%3C%2Fmi%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的圓弧曲面上的<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Ea%3C%2Fmi%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">點滑向<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Eb%3C%2Fmi%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">點，如圖所示，如果由于摩擦使木塊的運動速率保持不變，則以下敘述正確的是（　　）<p><img width="111" height="110" src="http://tikupic.21cnjy.com/2023/08/20/dd/30/dd303251b7dc280cbceb747bbd6a48f1.png" style="max-width:100%;"></p> </h1> <div id="mbjqfqh" class="exam-s"> <span id="yd87dfl" class="op-item"><span id="445lmcw" class="op-item-nut">A . </span><span id="uz8ducl" class="op-item-meat">木塊所受的合力為零</span></span> <span id="afpb2mv" class="op-item"><span id="3zlbtu7" class="op-item-nut">B . </span><span id="mrtqxxx" class="op-item-meat">因木塊所受的力對其都不做功，所以合力做的功為零</span></span> <span id="kc8dqa7" class="op-item"><span id="e54brku" class="op-item-nut">C . </span><span id="bgclgyk" class="op-item-meat">重力和摩擦力的合力做的功為零</span></span> <span id="99kt3sz" class="op-item"><span id="c5rnv3f" class="op-item-nut">D . </span><span id="3ohnv24" class="op-item-meat">重力和摩擦力的合力為零</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="ildzacy" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="5dyulmz" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=54692059" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預(yù)覽、分享更方便</p> </div> <div id="qcfl8sk" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過本題的試卷</h3> <ul class="extend-mc"> <li> <a href="/paper/view-5196691.shtml" target="_blank" title="黑龍江省某校2022-2023學(xué)年高一下學(xué)期期末物理試題" class="ex-tit"> 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