单项选择题
A.3个月B.不超过3个月C.6个月D.不超过6个月
A.0.8~1.5mmB.1~1.5mmC.0.8~1mmD.0.8~2mm
A.±1mm,1‰B.±0.5mm,1‰C.±2mm,2‰D.±0.5mm,1.2‰