Difference between revisions of "怎样考取低压电工证理论篇"
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怎样考取低压电工证理论篇
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== 辨异 ==
; 仪表
种类
: 电动式 仪表由固定的线圈,可转动的线圈及转轴、游丝、指针、机械调零机构等组成.
; 10
: 非高电阻率地区,避雷针接地电阻不大于 10Ω
; 电流频率
: 工频电流:工业用电频率的电流,一般 50Hz
: 高频电流:远高于高频电流,一般几百 kHz 至 MHz
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