单项选择题
A.不大于2mm B.不大于3mm C.不大于4mm D.不大于5mm
A.大于6mm B.大于5mm C.大于4mm D.大于3mm
A.15% B.20% C.25% D.30%
A.大于2mm B.大于3mm C.大于4mm D.大于5mm
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