云南三类人员考试云南三类人员专职安全员C证考试单项选择题每日一练(2018.07.30)

A.220V
B.110V
C.36V
D.24V

A.10mA
B.20mA
C.30mA
D.40mA

A.0.5m
B.1.0m
C.1.5m
D.1.8m

A.200mm
B.300mm
C.500mm
D.600mm

A.2m
B.2.5m
C.＞2.5m
D.≥3m