单项选择题
A.不小于2mm B.不小于3mm C.不小于4mm D.不小于5mm
A.不大于5mm B.不大于10mm C.不大于15mm D.不大于20mm
A.大于1mm B.大于2mm C.大于3mm D.大于4mm
A.大于0.5mm B.大于0.6mm C.大于0.7mm D.大于0.8mm
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