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id="4b0tbd7" class="op-item"><span id="8dnrt9f" class="op-item-nut">A . </span><span id="8j0r8dx" class="op-item-meat"><img width="168" height="87" src="http://tikupic.21cnjy.com/2024/04/15/b6/f4/b6f4a48e4811b257bc60bd91298ad50f.png" style="max-width:100%;"> <br>尺子伸出長(zhǎng)度越長(zhǎng)，音調(diào)越低</span></span> <span id="r3ip3hp" class="op-item"><span id="rdox8x5" class="op-item-nut">B . </span><span id="v2twivt" class="op-item-meat"><img width="79" height="89" src="http://tikupic.21cnjy.com/2024/04/15/db/a9/dba99c1cce796ca986de3066c11d2607.png" style="max-width:100%;"> <br>發(fā)聲的音叉激起水花</span></span> <span id="dvzz60r" class="op-item"><span id="vi5njel" class="op-item-nut">C . </span><span id="5ztwzmb" class="op-item-meat"><img width="120" height="142" src="http://tikupic.21cnjy.com/2024/04/15/8d/bf/8dbfed9973311f66cf112b94c1fa6b25.png" style="max-width:100%;"> <br>抽氣時(shí)，鐘罩內(nèi)傳出的鈴聲變?nèi)?/span></span> <span id="qa1vv3z" class="op-item"><span id="ypl4x0s" class="op-item-nut">D . 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