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. </span><span id="czybqgl" class="op-item-meat">后端的重物越大越好</span></span> <span id="zar50zd" class="op-item"><span id="osfsdxa" class="op-item-nut">B . </span><span id="vq1sj6k" class="op-item-meat">支點(diǎn)在桿的前端系繩處</span></span> <span id="e7xa6hk" class="op-item"><span id="wxpewhd" class="op-item-nut">C . </span><span id="gtmyfch" class="op-item-meat">向上汲水時(shí)動(dòng)力臂不變</span></span> <span id="loiwtwc" class="op-item"><span id="ad9gr0l" class="op-item-nut">D . </span><span id="ow4tzjv" class="op-item-meat">人用力向下拉繩子時(shí)，桔槔相當(dāng)于一個(gè)省力杠桿</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="4lfpoz4" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="lqfyiwb" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=56529338" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 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