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如圖所示，開關S閉合時，小燈泡<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsub%3E%3Cmtext%3EL%3C%2Fmtext%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmsub%3E%3Cmo%3E%E3%80%81%3C%2Fmo%3E%3Cmsub%3E%3Cmtext%3EL%3C%2Fmtext%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">都不亮，用一段導線的兩端接觸a、b兩點時，兩個小燈泡都不亮；接觸b、c兩點時，兩個小燈泡也不亮；接觸c、d兩點時，兩個小燈泡都亮。下列對電路故障的判斷正確的是（　?。?p style="text-align:justify;"><img src="http://tikupic.21cnjy.com/ct20241o/de/72/de72d4582a3d52296b956a09a3417db7.png" width="182" height="126" style="max-width:100%;"></p> </h1> <div id="2iel6m7" class="exam-s"> <span id="thlshyw" class="op-item"><span id="14a1q9v" class="op-item-nut">A . </span><span id="osw8prt" class="op-item-meat">小燈泡<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsub%3E%3Cmtext%3EL%3C%2Fmtext%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">斷路</span></span> <span id="kruk3wo" class="op-item"><span id="xmaq7pi" class="op-item-nut">B . </span><span id="odyo1a1" class="op-item-meat">小燈泡<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsub%3E%3Cmtext%3EL%3C%2Fmtext%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">斷路</span></span> <span id="y4p26bf" class="op-item"><span id="xcoilsw" class="op-item-nut">C . </span><span id="i2qhc7n" class="op-item-meat">小燈泡<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsub%3E%3Cmtext%3EL%3C%2Fmtext%3E%3Cmn%3E1%3C%2Fmn%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">短路</span></span> <span id="fjwfpqp" class="op-item"><span id="t7ilbi7" class="op-item-nut">D . </span><span id="lqjajh9" class="op-item-meat">開關S斷路</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="wt8gulk" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="pmif16d" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=58803530" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預覽、分享更方便</p> </div> <div id="7g2lefq" class="analyize-extend JV_question__papers"> <h3 class="extend-mt">使用過本題的試卷</h3> <ul class="extend-mc"> 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