试题与答案

办理调车进路时,XJJ3-4线圈自闭电路中XJJ第一组接点的作用是什么?

题型:问答题 简答题

题目:

办理调车进路时,XJJ3-4线圈自闭电路中XJJ第一组接点的作用是什么?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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