单项选择题
A.不小于25mm B.不小于35mm C.不小于45mm D.不小于55mm
A.大于34mm B.大于44mm C.大于54mm D.大于64mm
A.超过15% B.超过20% C.超过25% D.超过30%
A.小于2mm B.小于3mm C.小于4mm D.小于5mm
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