题目内容 (请给出正确答案)
提问人:网友d*******1 发布时间:2022年3月23日 22:29
[单项选择题]

起重机上行程开关的作用是什么()。

A.对机构行程或高度实行控制

B.对电机运行方向实行控制

C.对起重机运行速度实行控制

D.对起重量实行控制

参考答案
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