单项选择题
A.电压 B.电流 C.电阻 D.接触电阻
A.电压 B.电流 C.负载电流
A.导体 B.半导体 C.空气
A.0.5 B.1 C.2
A.升高 B.减小 C.不变
A.36 B.127 C.380
A.660 B.1140 C.3300
A.5B.10C.20
A.5 B.6 C.8
A.3 B.4 C.5
A.0.1 B.0.2 C.0.3