题目

如图所示，理想变压器次级的负载是三个电灯，初级串一个电灯后接到电源上．四个电灯完全相同，且都正常发光．图中各理想电表读数间的关系为（                                                        ）                                                                                              　   A．   I1=             B． I1=I2 C． U1=3U2   D． U1=U2                                                                                                                                     答案：B

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