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| Rockwell figure; Rockwell hardness figure; Rockwell hardness number | |||
| Rockwell hardness number | |||
| Rock well hardness number | |||
| Rockwell hardness scale; Rockwell number | |||
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洛氏硬度值 : 3 phrases in 2 subjects |
| Aviation | 2 |
| Metallurgy | 1 |
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