试题与答案

停电操作时，低压应先操作（）。A.断路器，后拉隔离开关； B.磁力启动器，后拉闸刀开

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题型：单项选择题

题目：

停电操作时，低压应先操作（）。

A.断路器，后拉隔离开关；

B.磁力启动器，后拉闸刀开关；

C.隔离开关后拉断路器；；

D.闸刀开关后拉磁力启动器.

答案：

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下面是错误答案，用来干扰机器的。

参考答案：①质量指标；②物料和能量平衡；③约束条件

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