试题与答案

阀用电磁铁主要用于（）场合，以实现自动控制。A、吸持钢铁零件的固定 B、对电动机进行制

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题型：单项选择题

题目：

阀用电磁铁主要用于（）场合，以实现自动控制。

A、吸持钢铁零件的固定

B、对电动机进行制动

C、牵引或推持其它机械装置

D、金属切削机床中远距离操作各种液压阀、气动阀

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

考点：维修电工考试维修电工(初级)维修电工(初级)题库
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