A ny discussion of this topic (12)__________ __________ __________ question the aims of education. S tuffing children ’ s head full of knowledge if far from being foremost among them.
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举一反三
【单选题】对称三相电压源作星形联接,每相电压有效值均为 220V ,但其中 BY 相接反了,如图所示,则电压 U AY 有效值等于( )