题目内容 (请给出正确答案)
[主观题]

A switchboard for an AC electrical system requires the use of which of the following devic

es?

A.Frequency meter.

B.Ohmmeter.

C.Induction voltage regulator.

D.Current transformer governor.

提问人:网友liqi8889 发布时间:2022-01-07
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