指正常运行时加在避雷器两端的电压有效值称为()A、额定电压 B、灭弧电压 C、冲击放 发布时间:2017-07-07 08:17 │ 来源:www.tikuol.com 题型:单项选择题 问题: 指正常运行时加在避雷器两端的电压有效值称为()A、额定电压B、灭弧电压C、冲击放电电压D、残压
题型:单项选择题 . ____ to speak when the audience interrupted him.A.No sooner had he beganB.Hardly had he begunC.Scarcely did he beginD.Not until he began 查看答案