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| 单词 | rockwell number |
| 释义 | Rockwell number in American Englishnoun Metallurgy a numerical expression of the hardness of a metal as determined by a test (Rockwell test) made by indenting a test piece with a Brale, or with a steel ball of specific diameter, under two successive loads and measuring the resulting permanent indentation Word origin [1930–35, Amer.; named after Stanley P. Rockwell, 20th-century American metallurgist] |
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