单项选择题
A.不大于1mm B.不大于2mm C.不大于3mm D.不大于4mm
A.大于200mm B.大于250mm C.大于300mm D.大于350mm
A.小于15mm B.小于16mm C.小于17mm D.小于18mm
A.不大于3mm B.不大于4mm C.不大于5mm D.不大于6mm
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