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11．电话的话筒可以把声音的变化转化为电流的变化炭精话筒的结构如图所示炭精盘和振动膜之间充满了接触不紧密的炭粒声音使振动膜振动改变炭粒 Template






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tomski11．电话的话筒可以把声音的变化转化为电流的变化炭精话筒的结构如图所示炭精盘和振动膜之间充满了接触不紧密的炭粒声音使振动膜振动改变炭粒 coloring
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11．电话的话筒可以把声音的变化转化为电流的变化炭精话筒的结构如图所示炭精盘和振动膜之间充满了接触不紧密的炭粒声音使振动膜振动改变炭粒 sketch template
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如图所示是动圈式话筒（麦克风）和扬声器（喇叭）的构造示意图，当人对着话筒说话时，产生的声音使膜片及与之相连的线圈一起振动，线圈在磁场中的这种 sketch template
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