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src="http://tikupic.21cnjy.com/4b/d0/4bd0595f975e39ff33943ebbc6e117fd.png" style="max-width:100%;"></p> </h1> <div id="vct78ui" class="exam-s"> <span id="ai5mlat" class="op-item"><span id="tqbpdnp" class="op-item-nut">A . </span><span id="se2qn3v" class="op-item-meat">橡皮做的勻速直線運(yùn)動，速度大小約為1.41m/s</span></span> <span id="ml89zj4" class="op-item"><span id="9u7byfo" class="op-item-nut">B . </span><span id="qkc1gyz" class="op-item-meat">橡皮做的是圓周運(yùn)動，速度大小不變，方向不斷改變</span></span> <span id="l43mbak" class="op-item"><span id="osm0oqr" class="op-item-nut">C . </span><span id="ywqfl79" class="op-item-meat">如果鉛筆從靜止開始做勻加速直線運(yùn)動，則懸線依然始終保持豎直</span></span> <span id="7snavc6" class="op-item"><span id="zu8g4xp" class="op-item-nut">D . </span><span id="xts9jsb" class="op-item-meat">如果鉛筆從靜止開始做勻加速直線運(yùn)動，則懸線不能始終保持豎直</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="dyv2ung" id="J_ConnectQuestionsdBox"> </div> </div> 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