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id="bbjpfl1" class="exam-s"> <span id="j9j15nr" class="op-item"><span id="dlhh1fx" class="op-item-nut">A . </span><span id="xzp5frj" class="op-item-meat">運動員到達(dá)最低點前重力勢能始終減小</span></span> <span id="r1zx9nd" class="op-item"><span id="fpdnjbj" class="op-item-nut">B . </span><span id="x5pptjn" class="op-item-meat">蹦極繩張緊后的下落過程中，彈力做負(fù)功，彈性勢能增加</span></span> <span id="9hjhrrb" class="op-item"><span id="hlf51v1" class="op-item-nut">C . </span><span id="txjzj7j" class="op-item-meat">蹦極過程中，運動員和蹦極繩所組成的系統(tǒng)機械能守恒</span></span> <span id="p5vhl3h" class="op-item"><span id="t1bxpf5" class="op-item-nut">D . </span><span id="1bpbz1x" class="op-item-meat">蹦極過程中，重力勢能的改變量與重力勢能零點的選取有關(guān)</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="vzj7dv3" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="jrdrl1n" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img 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