电务系统理论考试继电器单项选择题每日一练(2018.07.11)

A.30V
B.35V
C.40V
D.50V

A.0.15mm
B.0.2mm
C.0.3mm
D.0.35mm

A.180V
B.200V
C.220V
D.230V

A.13、54
B.13、55
C.12、54
D.13、53

A.AC8mA
B.AC10mA
C.AC12mA
D.AC30mA