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class="question-block"> <div id="bjnfxnh" class="q-mc"> <h1 class="q-tit"> 1. <a href="javascript:;" class="ques-origin " target="_self"> (2017高二上·安陽開學考) </a> 游樂場中的一種滑梯如圖所示．小朋友從軌道頂端由靜止開始下滑，沿水平軌道滑動了一段距離后停下來，則（　?。?p><img width="166" height="61" src="http://tikupic.21cnjy.com/49/01/4901560ca748717b5d390a683272681e.png" style="max-width:100%;"></p> </h1> <div id="n7pnplf" class="exam-s"> <span id="ndvbrfr" class="op-item"><span id="fnfd335" class="op-item-nut">A . </span><span id="jhhl95f" class="op-item-meat">下滑過程中支持力對小朋友做功</span></span> <span id="3dfnzzr" class="op-item"><span id="xbvbb5n" class="op-item-nut">B . </span><span id="hjzbprn" class="op-item-meat">下滑過程中小朋友的重力勢能增加</span></span> <span id="bvx13rn" class="op-item"><span id="9r5vbxv" class="op-item-nut">C . </span><span id="vf1fp7b" class="op-item-meat">整個運動過程中小朋友的機械能守恒</span></span> <span id="n3rt1tl" class="op-item"><span id="v355dhv" class="op-item-nut">D . </span><span id="zfbnjft" 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