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src="http://tikupic.21cnjy.com/ct20241o/ef/96/ef96fbb5ef2ea06bf9d5f6b80d3a9105.png" width="533" style="max-width:100%;"></p> </h1> <div id="uxhod3w" class="exam-s"> <span id="0moou8l" class="op-item"><span id="my8etmz" class="op-item-nut">A . </span><span id="bpmkcs0" class="op-item-meat">如圖甲，敲鼓時(shí)可觀察到紙面上的紙屑在不停地跳動(dòng)，說(shuō)明聲音的傳播需要介質(zhì)</span></span> <span id="qwrp2bw" class="op-item"><span id="qc7v2k7" class="op-item-nut">B . </span><span id="timhygv" class="op-item-meat">如圖乙，抽掉玻璃罩中的空氣，聽到鈴聲的音量不會(huì)變化</span></span> <span id="snolmom" class="op-item"><span id="s2h1ovd" class="op-item-nut">C . </span><span id="jlokkkk" class="op-item-meat">如圖丙，敲擊右邊的音叉，左邊的音叉將泡沫塑料球彈起，說(shuō)明聲音可以傳遞能量</span></span> <span id="wu52ezs" class="op-item"><span id="lzm7rm1" class="op-item-nut">D . </span><span id="r7vspzj" class="op-item-meat">如圖丁，改變鋼尺伸出桌邊的長(zhǎng)度，目的是為了改變發(fā)出聲音的響度</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  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