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• 12:55, 2 April 2020 Chao talk contribs created page Piezo Disc (Created page with "蜂鸣片的原理： 蜂鸣片是利用压电效应原理工作的，当对其施加交变电压时它会产生机械振动；<br> 反之，对其施加机械作用力时它...")