The original values of lead impedance and pacing thresholds were tested and compared by t-test between groups.
术中测定心房、心室起搏阈电压和电极阻抗，组间进行t检验。
Moreover, for the fixed power setting of PZT transducer, the temperature change can lead to difference in actual power and impedance of PZT transducer.
而且，对于恒定额定功率设置的PZT换能器系统，温度的改变导致PZT换能器实际加载的功率及阻抗的改变。
A guard is a low impedance point in the circuit that's at nearly the same potential as the high impedance lead being guarded.
保护是强制将电路中的一个低阻节点与高阻输入端节点近似等电位的一种技术。
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