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</div> <div id="z3ppnxb" class="crumbs g-cw"> <i class="iconw-fixed"></i> <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="3pvb7ph" class="m-wrap g-cw cfx"> <div id="hj1hd5d" class="w fl"> <div id="tfnj3jr" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="5lnblf9" class="question-block"> <div id="hhvlnjj" class="q-mc"> <h1 class="q-tit"> 1. <a href="javascript:;" class="ques-origin " target="_self"> (2017高二上·濟(jì)南開(kāi)學(xué)考) </a> 如圖所示為汽車(chē)在水平路面上啟動(dòng)過(guò)程中的速度圖象，Oa為過(guò)原點(diǎn)的傾斜直線(xiàn)，ab段表示以額定功率行駛時(shí)的加速階段，bc段是與ab段相切的水平直線(xiàn)，則下述說(shuō)法正確的是（　　）<p><img width="202" height="140" src="http://tikupic.21cnjy.com/4b/eb/4bebc6da2ad2cdaf5bdb95b7feba1d7c.png" style="max-width:100%;"></p> </h1> <div id="t7b5pj5" class="exam-s"> <span id="p7zlplp" class="op-item"><span id="tv51hv3" class="op-item-nut">A . </span><span id="j7vhvrb" class="op-item-meat">0～t<sub>1</sub>時(shí)間內(nèi)汽車(chē)做勻加速運(yùn)動(dòng)且功率恒定</span></span> <span id="ndz3zbf" class="op-item"><span id="zvd955t" class="op-item-nut">B . </span><span id="vvldj15" class="op-item-meat">t<sub>1</sub>～t<sub>2</sub>時(shí)間內(nèi)汽車(chē)牽引力做功為 <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%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;"> mv<sub>2</sub><sup>2</sup>﹣ <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;"> mv<sub>1</sub><sup>2</sup></span></span> <span id="vllp7zb" class="op-item"><span id="z9fjl13" class="op-item-nut">C . </span><span id="vnhlv9v" class="op-item-meat">t<sub>1</sub>～t<sub>2</sub>時(shí)間內(nèi)的平均速度為 <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%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;"> （v<sub>1</sub>+v<sub>2</sub>）</span></span> <span id="xv5zjv7" class="op-item"><span id="ldpznvt" class="op-item-nut">D . </span><span id="jr93z5l" class="op-item-meat">在全過(guò)程中t<sub>1</sub>時(shí)刻的牽引力及其功率都是最大值，t<sub>2</sub>～t<sub>3</sub>時(shí)間內(nèi)牽引力最小</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="5jpvzxf" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="xfl3ld1" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=5761187" 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