BAO Shanhui.Tracking the fp region of the piezoelectric transducer by the phase-locked loop circuit[J].Applied Acoustics,2002,20(3):1-5.是什么意思_BAO Shanhui.Tracking the fp region of the piezoelectric transducer by the phase-locked loop circuit[J].Applied Acoustics,2002,20(3):1-5.在线翻译_英语_读音_用法_例句