【判断题】
门禁系统就地设备由读卡器、磁力锁、开门开关三部分组成。
A. 对
B. 错
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答案
B
解析
暂无解析
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【判断题】
当变压器的原绕组加上交流电压，该绕组中就会有交流电流流过，在铁芯磁路中产生交变磁通，通过铁芯磁路传到副绕组，副绕组在这个磁场作用下产生感应电动势，这时在副绕组接上负载就有产生电流。
A. 对
B. 错
