谁知道这是什么样的材料吗?钢板 3-GB/T708-2006 10-Ⅱ-P-GB/T13237-1991

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• 谁知道这是什么样的材料吗?钢板 3-GB/T708-2006 10-Ⅱ-P-GB/T13237-1991
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