讨论了地电阻率临震突变的变化特点、变化形态和时、空间分布特征。
The paper also discussed the variation features of the sudden change of earth resistivity as well as the shape of sudden change and its temporal-spatial distribution.
目前突变型PTC元件电阻温度系数的测量方法各种各样，因此测试结果缺乏唯一性和可比性。
Resistance temperature coefficient (RTC) of step function PTC thermistor depends on it's measurement methods, therefor the obtained results are not unique and comparable.
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