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class="q-tit"> 1. <a href="/paper/view-5267664.shtml" class="ques-origin a-pointer" target="_blank"> (2023高一上·北京月考) </a> 用輕質(zhì)細(xì)繩連接的物塊AB放在光滑的水平地面上，物塊A、B質(zhì)量之比<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%3Em%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3EA%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmn%3E%EF%BC%9A%3C%2Fmn%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3Em%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3EB%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E3%3C%2Fmn%3E%3Cmn%3E%EF%BC%9A%3C%2Fmn%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> ，現(xiàn)用水平向左的拉力<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%3EF%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmtext%3EN%3C%2Fmtext%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">作用在物體A上，如圖示，則輕質(zhì)細(xì)繩對B的拉力大小等于（　　）<p><img width="331" height="74" src="http://tikupic.21cnjy.com/2024/03/04/87/ca/87ca91031fb7bb28accc2594c52635b1_380x86.png" style="max-width:100%;"></p> </h1> <div id="dp1l9zd" class="exam-s"> <span id="9bbrdf1" class="op-item"><span id="jjlrftn" class="op-item-nut">A . </span><span id="prt1nvn" class="op-item-meat">3N</span></span> <span id="xzf3hxx" class="op-item"><span id="hpj35bz" class="op-item-nut">B . </span><span id="3xzzhp9" class="op-item-meat">4N</span></span> <span id="vljz55t" class="op-item"><span id="7ztv9n7" class="op-item-nut">C . </span><span id="jxl5d5v" class="op-item-meat">6N</span></span> <span id="9pvnzbn" class="op-item"><span id="zltjx7f" class="op-item-nut">D . </span><span id="j7zrvhv" class="op-item-meat">12N</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="3lvnpbb" 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