单项选择题
A.0.5mm B.0.7mm C..08mm D.1.0mm
A.0.2~0.8mm B.0.3~1mm C.1~2mm D.1~3mm
A.0.1~0.2mm B.0.1~0.5mm C.0.2~0.5mm D.0.3~0.5mm