【单选题】【消耗次数：1】
激光唱机是利用
①
激光束来读取信息的
②
电磁转换原理来记录信息的
③
磁电转换原理来读取信息的
④
磁头作为记录和读取信息的器件
参考答案：
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【单选题】
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①
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②
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③
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④
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