晶闸管导通必须具备的条件是

晶闸管导通必须具备的条件是
A.阳极与阴极间加正向电压
B.门极与阴极间加正向电压
C.阳极与阴极加正压，门极加适当正压
D.阳极与阴极加反压，门极加适当正压
正确答案：C