正弦交变电流的电动势电压和电流都有最大值有效值即时值和平均值的区别以电动势为例最大值用em表示有效值用e表示即时值用e表示平均 Template




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tomski正弦交变电流的电动势电压和电流都有最大值有效值即时值和平均值的区别以电动势为例最大值用em表示有效值用e表示即时值用e表示平均 coloring