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通过表面涂敷IN－GA合金测量压敏电压和试样电阻率等实验手段,研究了ZNO和SRTIO3两种环形压敏电阻器的导电行为,得到了二者的导电模型.分析了导电模型不同的原因,并给出简单的鉴别方法.“,”s By using of In Ga electrodes,the voltage and resistivity of ZnO and SrTiO 3 varistors were measured.The different electric conduction principles of ZnO and SrTiO 3 ring varistors were analysed and two electric conduction models were suggested in the paper.