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| classification of nonmetallic inclusions; nonmetallic inclusion classification (【技】非金属夹杂物可按四种不同的角度进行分类：①按化学成分可分为氧化物夹杂物、硫化物夹杂物和氮化物夹杂物；②按加工特性可分为脆性夹杂物、塑性夹杂物和点状不变形夹杂物；③按来源可分为外来夹杂物、内生夹杂物；④按尺寸可分为大型夹杂物、显微类夹杂物和超显微类夹杂物。) | |||
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