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问题详情

一阶微分环节,当频率时,则相频特性为( )

A、45°             

B、-45°             

C、90°              

D、-90°

时间：2021-07-17 23:25 关键词：发电厂及电力系统高起专自动控制原理 2020年第二学期期末考试

答案解析

A

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