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<span id="zttljxh" class="op-item"><span id="fhjr73x" class="op-item-nut">A . </span><span id="z7pnjhp" class="op-item-meat">實(shí)驗(yàn)前應(yīng)將兩彈簧測(cè)力計(jì)調(diào)零</span></span> <span id="vjbpjdr" class="op-item"><span id="31zdlpv" class="op-item-nut">B . </span><span id="njzdvn3" class="op-item-meat">實(shí)驗(yàn)過(guò)程中，彈簧測(cè)力計(jì)外殼不能與木板有接觸</span></span> <span id="p3lrnld" class="op-item"><span id="fd1l55l" class="op-item-nut">C . </span><span id="tvzr1dx" class="op-item-meat">在合力不超過(guò)測(cè)力計(jì)量程及橡皮筋彈性限度的前提下，拉力的數(shù)值應(yīng)盡量大些</span></span> <span id="jzhb5rj" class="op-item"><span id="jvdzb3t" class="op-item-nut">D . </span><span id="xjrtlb3" class="op-item-meat">本實(shí)驗(yàn)應(yīng)作出力的示意圖來(lái)探究合力與分力的關(guān)系</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="5blft3p" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="r1vpp5h" class="g-sd2">  <div 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