单项选择题
A.492.5mm B.495.5mm C.496.5mm D.497.5mm
A.310.5mm B.311.5mm C.312.5mm D.313.5mm
A.<24h B.<36h C.<48h D.无要求
A.极卷的直径 B.极卷的外观、尺寸 C.极卷重量 D.物料车的外观
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