【单选题】【消耗次数：1】
对电缆进行直流耐压试验时，其优点之一是避免（）对良好绝缘起永久性破坏作用
①
A直流电压
②
B交流低压
③
C交流高压
④
D交流电流
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将交流电变成直流电的过程称作[填空]
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