当加到它两端的交流电压的频率和晶片的共振频率相相等时，输出的能量最大，灵敏度也最高。
When added to the ac voltage across it and the chip frequency of the resonant frequency of the phase are equal, the maximum energy output, sensitivity is highest.
使端部的两个电极（11、12）的电位相等，并在中间电极 （13）与端部电极（11、12）之间施加电压。
Potentials of two electrodes (11, 12) at two ends are equaled and voltage is applied between the intermediate electrode (13) and the end electrodes (11, 12).
这时，输出正负电压始终对称，变化量相等。
In this case, the output voltage variations will be equal and opposite at the positive and negative outputs.
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