如图所示把正在响铃的闹钟放在玻璃罩内逐渐抽出其中的空气将听到 A.声音越来越大b.声音越来越小c.声音大小保持不变d.音调越来越低 Template




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tomski如图所示把正在响铃的闹钟放在玻璃罩内逐渐抽出其中的空气将听到 a.声音越来越大b.声音越来越小c.声音大小保持不变d.音调越来越低 coloring