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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: 磁电式 仪表由固定的<u>永久磁铁</u>,可转动的<u>线圈</u>及转轴、游丝、指针、机械调零机构等组成.
;
10
Ω
: 非高电阻率地区,避雷针接地电阻不大于
10Ω
10Ω
: I 类工具绝缘电阻不超过 2Ω
; 电流频率
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