multi-frequeny channel ground detector
multi crystal thermistor，多昌热敏电阻器 multi-frequeny channel ground detector，多频道地电仪 multi-runctioninstrument，多功能（测量）仪表 ..
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frequeny channel ground detector
ground meteorological detector 地面气象探测器 frequeny channel ground detector 多频道地电仪 voltmeter type ground detector 伏特计式检漏器 ; 伏特计式通地指示器 ..
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