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问题详情

电压u(t)=10+20√2cos(100y+50)+30√2cos(300t-50)V，则该电压的有效值为

A、60V

B、10V

C、√102+202+302=37.42V

时间：2021-09-01 23:39 关键词：青书学堂黑龙江科技大学电路分析基础（专升本）

答案解析

C

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