A.觸發(fā)電流 B.強(qiáng)觸發(fā)電流 C.掣位電流 D.導(dǎo)通電流
A.i=U/R B.i=Um/R C.I=U/R D.I=Um/R
A.L B.ωL C.1/ωL D.1/2πfL