单相半波可控整流电路带大电感负载并接有续流二极管,整流变压器副边的电压有效值为90V,在α=180°时输出电压平均值为()V。
A.0
B.45
C.60
D.90
参考答案:A
________to attract young readers, the book is full of interesting stories and features simple language.
A.Aiming
B.Aimed
C.Contributed
D.Contributing
肌肉粘滞性