单项选择题
A.±3mm B.±1mm C.≤2mm D.±2mm
A.≤2mm≤2mm≤1个≤2个 B.≤3mm≤1mm≤1个≤2个 C.≤2mm≤1mm≤2≤2 D.≤2mm≤2mm≤1个≤1个
A.±0.5mm,2±0.5mm B.≤0.5cm,2±0.5mm C.≤0.5mm,3±0.5mm D.≤0.2mm,3±0.5mm