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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: III 类工具工作电压不超过 50V
: 常用交流接触器最高工作电压 380V，矿用 600V，说 6000V 太夸张了
: 低压绝缘材料的耐压等级一般为500V
; Hz
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