变电站考试土建单项选择题每日一练(2018.09.29)

A.1.5m~1.8m
B.1.9m~2.1m
C.2.2m~2.3m
D.2.5m~3.0m

A.100mm~150mm
B.150mm~200mm
C.200mm~300mm
D.300mm~450mm

A.安全围栏
B.专人监护
C.安全标志
D.隔离带

A.1
B.1.5
C.2
D.2.5

A.30°
B.45°
C.60°
D.75°