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如圖所示，粗糙水平地面上的長(zhǎng)方體物塊將一重為G的光滑圓球抵在光滑豎直的墻壁上，現(xiàn)用水平向右的拉力F緩慢拉動(dòng)長(zhǎng)方體物塊，在圓球與地面接觸之前，下面的相關(guān)判斷正確的是（　?。?p><img width="173" height="106" src="http://tikupic.21cnjy.com/18/89/1889b48027d5811a26c508b8bd6b5043.png" style="max-width:100%;"></p> </h1> <div id="17jtjh5" class="exam-s"> <span id="ndlvbp5" class="op-item"><span id="bjxbx57" class="op-item-nut">A . </span><span id="75v9jzf" class="op-item-meat">球?qū)Ρ诘膲毫χ饾u減小</span></span> <span id="drtl7fn" class="op-item"><span id="9jx7h7z" class="op-item-nut">B . </span><span id="dvxnlxp" class="op-item-meat">地面對(duì)長(zhǎng)方體物塊的支持力逐漸增大</span></span> <span id="npdvfvh" class="op-item"><span id="pf39t9t" class="op-item-nut">C . </span><span id="bz79nl7" class="op-item-meat">地面對(duì)長(zhǎng)方體物塊的摩擦力逐漸增大</span></span> <span id="nh9jtbn" class="op-item"><span id="hjlf5lr" class="op-item-nut">D . </span><span id="p9d9nll" class="op-item-meat">水平拉力F逐漸減小</span></span> </div> </div> </div> </li> </ul> <div 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