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如圖所示，將一把鐵鎖用繩子懸掛起來，把它拉到自己的鼻子附近，松手后鐵鎖來回擺動，最后停止。下列說法正確的是（　?。?p><img width="216" height="158" src="http://tikupic.21cnjy.com/2024/05/06/f8/1f/f81fb563dbd152f2b6f818093afa729b.png" style="max-width:100%;"></p> </h1> <div id="1gsx8gf" class="exam-s"> <span id="be7a38g" class="op-item"><span id="hv2o7ji" class="op-item-nut">A . </span><span id="uw7ttrx" class="op-item-meat">擺動過程中，鐵鎖的重力勢能保持不變</span></span> <span id="nzu3kkm" class="op-item"><span id="kykspqo" class="op-item-nut">B . </span><span id="hdvuss1" class="op-item-meat">擺動過程中，只存在動能和重力勢能的相互轉(zhuǎn)化</span></span> <span id="p8uba3f" class="op-item"><span id="jojzwc1" class="op-item-nut">C . </span><span id="gkkl8nr" class="op-item-meat">擺動過程中，鐵鎖的機械能在減小</span></span> <span id="6fip5q8" class="op-item"><span id="lpyx1kc" class="op-item-nut">D . </span><span id="wcvyed7" class="op-item-meat">擺動過程中，繩子對鐵鎖的拉力一直做功</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div 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