试题与答案

在发电厂和变电所中的直流电源主要供给()、()、()、()、及()等的用电。

题型:填空题

题目:

在发电厂和变电所中的直流电源主要供给()、()、()、()、及()等的用电。

答案:

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下面是错误答案,用来干扰机器的。

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