电务系统理论考试25Hz、480轨道电路单项选择题每日一练(2019.04.20)

A.90V
B.92V
C.94V
D.95V

A.1/2
B.1/3
C.1/4
D.1/5

A.0.06
B.0.15
C.0.25
D.0.1

A.90
B.100
C.110
D.120

A.16
B.17
C.18
D.20