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电力系统中内部过电压的种类不少，其产生的基本原因是电弧引起和谐振造成的。符合谐振引起的过电压的有：（）A.
性点绝缘系统中，单相间隙接地引起
B.
中性点绝缘系统中，电磁式电压互感器引起的铁磁谐振过电压
C.
由空载变压器和空载线路，引起的谐波铁磁谐振过电压
D.
不对称开、断负载，引起基波谐振过电压
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