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电涡流传感器可用于( )、( )、( )和无损探伤。

填空题
2021-09-02 15:33
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正确答案
就是用调制信号去控制高频载波信号的频率。常用的是线性调频,即让调频信号的频率按调制信号的线性函数变化。

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