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勃氏硬度數
释义
勃氏硬度數
bó shì yìng dù shù
一种表示金属表面硬度记法。由瑞典工程师勃林南尔提出，使用一定直径的硬钢球，以一定力打击金属表面，量其凹痕面积算出硬度。
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fire-resistant coating for steel structure
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更新时间：2025/4/7 16:00:39