如图<img alt="/upload/photos/20190626/ab843db579634abb9b98c34172774030.png" src="/upload/photos/20190626/ab843db579634abb9b98c34172774030.png" />所示,R为电阻,C为电容,L为电感,u(t)为交流电源。当交流电源的频率增加时,(____)灯亮度增大。
A.ELA B.ELB C.ELC D.ELA和ELB正确答案A
如图<img alt="/upload/photos/20190626/ab843db579634abb9b98c34172774030.png" src="/upload/photos/20190626/ab843db579634abb9b98c34172774030.png" />所示,R为电阻,C为电容,L为电感,u(t)为交流电源。当交流电源的频率增加时,(____)灯亮度增大。
A.ELA B.ELB C.ELC D.ELA和ELB正确答案A