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如圖所示，閉合開(kāi)關(guān)S時(shí)，小電燈L<sub>1</sub>、L<sub>2</sub>都不亮．用一段導(dǎo)線的兩端接觸a、b兩點(diǎn)時(shí)，兩燈都不亮；接觸b、c兩點(diǎn)時(shí)，兩燈也不亮；接觸c、d兩點(diǎn)時(shí)，兩燈都亮．對(duì)此，下列斷中正確的是（　?。?p><img width="142" height="88" src="http://tikupic.21cnjy.com/56/1d/561dda9b6e00dee4bb6abfceac267144.png" style="max-width:100%;"></p> </h1> <div id="hrbttbj" class="exam-s"> <span id="jxpjlp9" class="op-item"><span id="rbjd5v1" class="op-item-nut">A . </span><span id="lrjfppd" class="op-item-meat">燈L<sub>1</sub>斷路</span></span> <span id="rzl1rxh" class="op-item"><span id="bhjrlfn" class="op-item-nut">B . </span><span id="hp515nl" class="op-item-meat">燈L<sub>2</sub>斷路</span></span> <span id="nlzjvd1" class="op-item"><span id="rdphflt" class="op-item-nut">C . </span><span id="rpdn5d3" class="op-item-meat">開(kāi)關(guān)S斷路</span></span> <span id="zhxjjfr" class="op-item"><span id="lj177jt" class="op-item-nut">D . </span><span id="pl15jxr" class="op-item-meat">燈L<sub>2</sub>短路</span></span> </div> </div> </div> </li> 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