“Rockwell hardness”的概念、定义、翻译、参考文献-科学参考

单词	Rockwell hardness
释义	Rockwell hardness Encyclopedia 工学硬度计量释 Rockwell hardness洛氏硬度美国人洛克威尔兄弟（S.P.洛克威尔和H.M.洛克威尔）于1919年提出，并以其名字命名的硬度指标。
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