A.0.693C2R1R2/(R1+R2) B.0.693(R1+R2)/C2R1R2 C.0.693R2C2 D.0.693R1C1
A.60° B.90° C.120° D.150°
A.空心電感器 B.快速熔斷器 C.實心電感器 D.C、R組成的阻容吸收裝置