井下作业工具工(初级)单项选择题每日一练(2019.05.08)

A.10
B.12
C.15
D.20

A.1
B.0.1
C.0.01
D.0.001

A.K
B.X
C.Y
D.Z

A.下工具
B.液压
C.提放管柱
D.转管柱

A.105
B.118
C.120
D.145