利用等效弹性法分析了压电矩形共振器的二维耦合振动，导出了振子共振频率的解析表达式。
Based on the equivalent elasticity method, the plane coupling vibration of a rectangular piezoelectric ceramic plate was studied and the resonant frequency equation was derived out.
具有热电和压电的双重效应，与人体磁场形成共振共鸣。
Double with thermoelectric and piezoelectric effect, and the formation of the human body magnetic resonance resonance.
说明压电晶体的特性和与压电晶体的共振频率有关的因数，以及脉波-波法的过程。
Explain the characteristics of piezoelectric crystals and the factors relating to the resonant frequencies of a piezoelectric crystal, and the procedure of the pulse-echo method.
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