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powder metallurgy iron-based products
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powder metallurgy iron-based products
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粉末冶金材料
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powder metallurgy iron-based products
粉末冶金铁基零件
以钢铁粉末为原料,采用粉末冶金技术制造的一类机械零件。又称烧结铁基零件。
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algebraic manifold
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algebraic number theory
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