单项选择题Choose the best reply to each question. A、 He studies English EVERY day. B、HE studies English every day. C、He studies ENGLISH every day. D、
单项选择题负载上交流电u=100sin(314t-50°)V,i=10sin314tA,,则负载是( )。A. 纯电阻性的B. 纯电感性的C. 感性的D. 容性的