【判断题】【消耗次数:1】
施工现场灯具金属外壳不应接保护零线
正确
错误
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①  正确
②  错误
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①  正确
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①  正确
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【判断题】 严禁用黄绿双色、黑色、蓝色线当相线,也严禁用黄色、绿色、红色线作为工作零线和保护零线。()
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