单项选择题
A.不大于0.1mm B.不大于0.3mm C.不大于0.5mm D.不大于0.6mm
A.不大于0.5mm B.不大于1mm C.不大于0.6mm D.不大于0.8mm
A.不大于0.2mm B.不大于0.3mm C.不大于0.25mm D.不大于0.28mm