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3A21铝板厚0.5mm 0.8 1 1.5 2 3 4 5 6F 8 10 12 14 15 16 18 20m
铝合金7A04 7A09 2A11 2A12 2A12T4 2A14铝板实心棒5a0k6 6f3a21
