单项选择题
A.0.5mm B.0.6mm C.0.7mm D.0.8mm
A.16mm-2mm B.16mm C.16mm±2mm D.16mm+2mm
A.(4mm±0.5mm)×30mm B.(4.5mm±0.5mm)×30mm C.(5mm±0.5mm)×30mm D.(3.5mm±0.5mm)×30mm