矿灯管理工矿灯管理工(初级)单项选择题每日一练(2019.01.18)

A.3.5±0.1
B.4±0.1
C.4.5±00.1
D.5±00.1

A.降低
B.升高
C.忽高忽低
D.不变

A.0.5
B.0.2
C.0.1
D.0.4

A.0.1
B.0.15
C.0.2
D.0.25

A.85%
B.90%
C.80%
D.95%