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src="http://tikupic.21cnjy.com/15/b7/15b7ce1483f5453c7b6cf5806083f22f.png" style="max-width:100%;"></p><p><br></p> </h1> <div id="99bbhrl" class="exam-s"> <span id="bzbuall" class="op-item"><span id="7nsr9is" class="op-item-nut">A . </span><span id="hdxm2bd" class="op-item-meat">傘面被向下“吸”</span></span> <span id="axtlioq" class="op-item"><span id="pstjjjc" class="op-item-nut">B . </span><span id="g13rhjb" class="op-item-meat">傘面被向上“吸”</span></span> <span id="ki2joen" class="op-item"><span id="dbco4ee" class="op-item-nut">C . </span><span id="4slvqbb" class="op-item-meat">傘上方的空氣流速小于下方</span></span> <span id="mkvbzcz" class="op-item"><span id="srlahp7" class="op-item-nut">D . </span><span id="lnqiwwm" class="op-item-meat">傘上方的空氣流速大于下方</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="h7njmvp" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="71asc5l" class="g-sd2">  <div 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