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<span id="rn77jzj" class="op-item"><span id="7bnvb75" class="op-item-nut">A . </span><span id="d7bj7tr" class="op-item-meat">小球運(yùn)動(dòng)到最高點(diǎn)時(shí)加速度為零</span></span> <span id="bdxndf7" class="op-item"><span id="jdzjhpb" class="op-item-nut">B . </span><span id="7vzvxdp" class="op-item-meat">小球受到重力和拉力的作用，機(jī)械能不守恒</span></span> <span id="77jt7nh" class="op-item"><span id="nfbxfrz" class="op-item-nut">C . </span><span id="ln777x7" class="op-item-meat">小球運(yùn)動(dòng)到最低點(diǎn)時(shí)所受重力與拉力大小相等</span></span> <span id="brjhx7z" class="op-item"><span id="pvz7b7x" class="op-item-nut">D . </span><span id="xdjrbnr" class="op-item-meat">以最低點(diǎn)為重力勢(shì)能零點(diǎn)，則小球具有的機(jī)械能為mgl（1﹣cosθ）</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="fvxxptn" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="77xlntd" class="g-sd2">  <div style="background:#fff;padding:20px 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