试题与答案

过电流保护的接线方法有：三相三继电器（）；两相双继电器（），两相单继电器（）。

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题型：填空题

题目：

过电流保护的接线方法有：<1>三相三继电器（）；<2>两相双继电器（），<3>两相单继电器（）。

答案：

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参考答案：D

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