题目: 当交流电源电压加到变压器的一次绕组后,以下说法正确的有()。A.在变压器铁芯中将产生交变磁通B.在变压器铁芯中将产生不变磁通C.如果变压器的二次侧绕组与外电路负荷连通,就会有电能输出D.如果变压器的二次侧绕组与高压绕组连通,就会有电能输出 答案: 参考答案:A, C
题型:选择题 __________ is often the case with her, my mother talked about my study for at least half an hour nonstop before she drove me to school yesterday.A.AsB.WhichC.WhatD.That 查看答案