A.電壓 B.電場(chǎng) C.電傷 D.電擊
A.9μF,50V B.9μ,20V C.2μF,50V D.2μF,20V
A.R>R1>R2 B.R1>R>R2 C.R1>R2>R D.R>R2>R1