河南三类人员考试河南三类人员专职安全员C证考试单项选择题每日一练(2019.01.15)

A.20m
B.30m
C.40m
D.50m

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

A.80cm
B.90cm
C.100cm
D.110cm

A.吊笼
B.底笼
C.底架
D.导轨架

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