A.Sc=1 B.0.5＜Sc＜0.8 C.Sc＜1 D.Sc≥1
A.有功电流 B.无功电流 C.视在电流 D.瞬时电流
A.定频调宽法B.定宽调频法C.调频调宽法D.上述三种均是
A.页码 B.分页符 C.页眉 D.页脚
A.10s B.5s C.1s D.0.1s
