【单选题】
电感两端的电压相位超前电流___。
A. 90°
B. 180°
C. 360°
D. 30°
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答案
A
解析
暂无解析
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18在单相桥式整流电容滤波电路中，设U2为其输入电压，输出电压的平均值约为___。
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【单选题】
20在半波整流电容滤波电路中，设U2为其输入电压，输出电压的平均值约为___。
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