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<span>/</span> <a href="javascript:;">多選題</a> </div> <div id="eshf345" class="m-wrap g-cw cfx"> <div id="kgpnm30" class="w fl"> <div id="jt226sz" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="lx5djcq" class="question-block"> <div id="3nnsihi" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5297412.shtml" class="ques-origin a-pointer" target="_blank"> (2024·黔東南模擬) </a> 如圖所示，電源電壓保持不變，定值電阻<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E0%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E6%3C%2Fmn%3E%3Cmtext%3E%CE%A9%3C%2Fmtext%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">。將滑片滑到滑動變阻器的b端時，閉合開關，電壓表的讀數(shù)為3V；將滑片滑到滑動變阻器的中點時，電壓表的讀數(shù)為4.5V。下列判斷正確的是（ ?。?p><img width="151" height="139" src="http://tikupic.21cnjy.com/2024/05/07/92/38/923879aae379aa02068663bc521216ed.png" style="max-width:100%;"></p> </h1> <div id="pla6tcm" class="exam-s"> <span id="ip4arj6" class="op-item"><span id="tbzz2hb" class="op-item-nut">A . </span><span id="w1l33tm" class="op-item-meat">電源電壓是9V</span></span> <span id="jwo3ueu" class="op-item"><span id="2x3pzzq" class="op-item-nut">B . </span><span id="tu4s7wo" class="op-item-meat">滑動變阻器的最大阻值是9Ω</span></span> <span id="bgdea4u" class="op-item"><span id="21cihgq" class="op-item-nut">C . </span><span id="lbenewd" class="op-item-meat">移動滑片，電路中的R最大功率是3.375W</span></span> <span id="rpmbou3" class="op-item"><span id="j9ynrlk" class="op-item-nut">D . </span><span id="58cumkt" class="op-item-meat">移動滑片，<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3ER%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E0%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">在通電100s內產生的熱量最多135J</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="nqsjs1j" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="vd3zofb" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=56604458" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預覽、分享更方便</p> </div> <div id="wrfe45z" 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-5297412.shtml" target="_blank" title="貴州省黔東南州2024屆九年級物理中考模擬試題" class="ex-tit"> <b></b><span>貴州省黔東南州2024屆九年級物理中考模擬試題</span> </a> </li> </ul> </div>  <div id="iv5vcc4" class="JV_question__subject"> <ul class="subjects-recomm"> <li> <a href="/merge?id=394" target="_blank"> <img src="https://tikupic.21cnjy.com/2024/11/13/76/a7/76a76e6216d40a4b182e08db669f4e9c.jpg"> 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