单项选择题
A.0.70±0.05mm B.0.70±0.03mm C.0.70±0.02mm D.0.70±0.01mm
A.GB/T2951.32-2008 B.GB/T2951.14-2008 C.GB/T2951.31-2008 D.GB/T2951.12-2008
A.10 B.6 C.5 D.3