铁路货车段检修技术知识竞赛单项选择题每日一练(2018.11.24)

A.15mm
B.20mm
C.25mm
D.30mm

A.2~20
B.3~20
C.2~22
D.3~22

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

A.50mm
B.68mm
C.88mm
D.80mm

A.正火
B.淬火
C.回火
D.退火