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<p>如圖，水平地面上有三個靠在一起的物塊P、Q和R，質(zhì)量分別為m、2m和3m，物塊與地面間的動摩擦因數(shù)都為μ．用大小為F的水平外力推動物塊P，記R和Q之間相互作用力與Q與P之間相互作用力大小之比為k．下列判斷正確的是（　?。?/p><p align="left"><img width="184" height="52" src="http://tikupic.21cnjy.com/57/17/571776d2b5ca8c4593382a6bed0bca90.png" style="max-width:100%;"></p> </h1> <div id="wq8q84g" class="exam-s"> <span id="cigucmw" class="op-item"><span id="maoeq8y" class="op-item-nut">A . </span><span id="6qqke4i" class="op-item-meat">若μ≠0，則k= <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E5%3C%2Fmn%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="qyouwyo" class="op-item"><span id="iamugso" class="op-item-nut">B . </span><span id="qakyuoc" class="op-item-meat">若μ≠0，則k= <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E3%3C%2Fmn%3E%3Cmn%3E5%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="6ye8w88" class="op-item"><span id="ikkqais" class="op-item-nut">C . </span><span id="em4mmiw" class="op-item-meat">若μ=0，則k= <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"></span></span> <span id="cg448iu" class="op-item"><span id="wmc2c4g" class="op-item-nut">D . </span><span id="csgg4ks" class="op-item-meat">若μ=0，則k= <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmfrac%3E%3Cmn%3E3%3C%2Fmn%3E%3Cmn%3E5%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%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="y4iwgmu" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="g8mm4ek" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=4025611" 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="uiymyok" 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-198628.shtml" target="_blank" title="2017年高考物理真題試卷（海南卷）" class="ex-tit"> <b></b><span>2017年高考物理真題試卷（海南卷）</span> </a> </li> 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