试题与答案

由正常工作电源转换到事故状态下备用电源的切换时间为()。A、5ms以下 B、5~10m

题型:单项选择题

题目:

由正常工作电源转换到事故状态下备用电源的切换时间为()。

A、5ms以下

B、5~10ms

C、10~15ms

D、15ms以上

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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