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如圖所示，用輕繩將一條形磁鐵豎直懸掛于<em>O</em>點(diǎn)，在其正下方的水平絕緣桌面上放置一銅質(zhì)圓環(huán)?，F(xiàn)將磁鐵從<em>A</em>處由靜止釋放，經(jīng)過(guò)<em>B</em><em>、</em><em>C</em>到達(dá)最低處<em>D</em> ，再擺到左側(cè)最高處<em>E</em> ，圓環(huán)始終保持靜止。下列說(shuō)法正確的是（　?。?p><img width="127" height="162" src="http://tikupic.21cnjy.com/2023/08/19/5c/15/5c1593e56256f7c3d6382a4d4e8447e2_146x187.png" style="max-width:100%;"></p> </h1> <div id="2bk7kl7" class="exam-s"> <span id="okj3zid" class="op-item"><span id="viadbdx" class="op-item-nut">A . </span><span id="r3p9b7e" class="op-item-meat">磁鐵在<em>A</em><em>、</em><em>E</em>兩處的重力勢(shì)能相等</span></span> <span id="zdupwhk" class="op-item"><span id="2foifps" class="op-item-nut">B . </span><span id="daifv2k" class="op-item-meat">磁鐵從<em>A</em>擺到<em>D</em>的過(guò)程中，圓環(huán)給桌面的壓力大于圓環(huán)的重力</span></span> <span id="fli72bz" class="op-item"><span id="qvmmajg" class="op-item-nut">C . </span><span id="c4rwrcp" 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