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src="http://tikupic.21cnjy.com/2021/12/23/91/db/91db9220b3e42c44058c912792f400fb_216x48.png" style="max-width:100%;"></p> </h1> <div id="ouo1ba4" class="exam-s"> <span id="ezc9dzr" class="op-item"><span id="ti6mkb5" class="op-item-nut">A . </span><span id="apv8yav" class="op-item-meat">因為不是正電荷定向移動，所以沒有電流</span></span> <span id="uadvjzi" class="op-item"><span id="8avh5b3" class="op-item-nut">B . </span><span id="oo3u8s1" class="op-item-meat">電流方向為a→b</span></span> <span id="ngj6vxy" class="op-item"><span id="ndxjs38" class="op-item-nut">C . </span><span id="d2crkme" class="op-item-meat">電流方向為b→a</span></span> <span id="oxaz0y0" class="op-item"><span id="rfjbh1a" class="op-item-nut">D . </span><span id="olxphho" class="op-item-meat">無法判斷電流方向</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="ntw20dm" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="rxrbaij" class="g-sd2">  <div 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